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If your monitor arm sinks, first check that the display is within the arm’s rated weight range and securely mounted, then increase the gas-spring tension gradually using the instructions for that exact model. If the arm holds its height but the screen tilts down, check the tilt joint instead: it has a separate adjustment on some arms. The screw location, tool size and turning direction vary, so support the monitor and follow the matching manual rather than assuming a universal fix.
What is moving: the whole arm, the screen angle, or the arm sideways?
Identify the movement before adjusting anything. Vertical spring tension is meant to balance the monitor’s weight as the arm moves up and down; it is not the right first adjustment for every kind of drift. Watch the arm and screen separately for a moment: note whether the support arm changes height, whether the screen’s angle changes while its height stays put, or whether the assembly shifts sideways or wobbles.
- The whole arm sinks or rises: the spring balance may need adjustment, or the screen may be outside the arm’s supported weight range.
- The arm stays at the same height but the screen tips down: inspect the tilt joint and its model-specific adjustment.
- The arm moves sideways, wobbles or feels loose: check the mounting and joints before changing spring tension.
These symptoms can overlap. For example, a loose attachment can make an otherwise balanced arm unstable, so check the physical setup before treating every movement as a tension problem. A useful first question is whether the screen changes position in the same direction each time, or whether it feels loose and unpredictable. Consistent vertical sinking points toward spring balance; a screen that slowly nods forward points toward tilt; movement at the desk or an uncertain wobble calls for a mounting and fastener check.
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Do not use the spring adjustment as a catch-all fix. A tension change intended to address vertical movement may not correct a loose tilt joint, a VESA plate that is not seated, or a desk attachment that has shifted. Matching the symptom to the adjustment helps avoid turning the wrong screw and gives you a clearer description if you need to ask the manufacturer for help.
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What should you check before adjusting the arm?
Confirm that the monitor, VESA plate and desk attachment are secure, and that the display is within the arm’s published load limits. Fellowes advises checking that an arm supports the screen’s size and weight; its installation guidance also recommends checking connectors and fasteners when investigating shaking. Fellowes’ monitor-arm installation and adjustment advice is general guidance, so use the instructions for your own model for its specific mounting and adjustment details.
- Check the monitor’s weight against the arm’s rating. Do not assume that a screen that physically fits the VESA plate is within the arm’s load range. A plate can fit while the display is still too heavy, or outside the published range in another way. Compare the monitor’s actual weight with the arm’s stated minimum and maximum rather than relying on screen size alone.
- Check the VESA connection. Confirm that the plate is attached to the monitor and locked onto the arm as the manual directs. Look for a plate that appears crooked, incompletely seated or loose, but do not remove parts or improvise a locking method.
- Check the desk mount. Inspect the clamp or grommet attachment for looseness or visible damage. If the mount has shifted, or the surface connection does not appear secure, do not try to compensate by increasing spring tension.
- Check the arm’s joints and fasteners. Look for loose connectors, set screws or other visible issues, but do not dismantle the arm based on generic instructions. Some manufacturers provide model-specific checks for joints or set screws; follow them only when they match your arm.
Stop if an attachment is visibly damaged, a screw is stripped or the arm remains unstable. Continuing to adjust an unstable mount can allow the monitor to drop or swing unexpectedly. Keep the screen supported while you inspect it, and do not put your hands where a moving joint could trap them. If you cannot tell whether a plate or attachment is locked correctly, consult the manual or contact the maker rather than testing it by pulling on the monitor.
Before any adjustment, identify the exact arm model. Check the label on the arm, its packaging or its paperwork, then use that model identifier to find the matching manual or support page. Similar-looking arms can place their adjustment points in different locations and may use different tools or directions. If the label is missing or unreadable, a photo of the arm and any identifying marks can help the manufacturer identify it; do not assume another model’s instructions apply.
How do you adjust a gas-spring arm that sinks or rises?
For vertical movement, use the arm’s spring-tension adjustment—not the tilt control—and follow the manual for the exact model. Support the monitor throughout the adjustment, make small changes, and recheck its position after each one. The goal is for the arm to stay at the chosen height, not to force it to move stiffly or to hold only in one position.
- Find the exact model instructions. Use the manual or support page for the arm you own. Locate the adjustment point, required tool and the manufacturer’s direction for increasing or decreasing tension. These details differ among products. If the manual calls for a particular starting position, use that position rather than guessing where the arm should be.
- Securely support the screen. Hold the monitor so it cannot fall or swing while the spring balance changes. If the manual specifies a starting position, such as placing the arm around its middle or horizontal position, follow that instruction. Keep the screen controlled as you work; do not leave it to move freely while tension is being changed.
- Match the adjustment to the movement. If the monitor sinks, the spring may need more tension; if it rises on its own, it may need less. Follow the arm’s own “+” or “−” marks and manual. Do not assume that clockwise or counterclockwise is the same direction across models.
- Use the specified tool and adjust gradually. Start with the supplied tool if available. Make a small adjustment, then check whether the arm holds the desired height before making another. Avoid forcing a screw or continuing if it feels stripped or damaged. Do not substitute a key size based on guesswork: the required size is model-specific.
- Recheck the full range of movement. Move the monitor carefully and see whether it remains where positioned rather than sinking or rising. If the correct adjustment does not resolve the issue, stop and contact the manufacturer.
Adjust only the spring tension that corresponds to the observed vertical movement. A screen that rises on its own is not asking for more tension; a screen that sinks is not a reason to tighten every joint. Once the adjustment is made, check the arm at the positions where you normally use it, moving it carefully rather than letting it swing. If it holds at one height but drifts elsewhere, consult the model manual for its recommended checking procedure and contact the manufacturer if the adjustment range does not solve the problem.
For one specific example, SIIG’s support knowledge base says to use the included Allen key to turn the tension bolt toward the “+” side until the monitor stays at the desired height. That is SIIG’s model-specific instruction, not a universal turning rule. SIIG’s monitor-arm troubleshooting guidance also advises contacting its support team if increasing tension does not stop the droop. Use the included key and the indicated “+” marking only when the instructions for your arm say to do so.
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ACT’s support instructions for its AC8310 likewise address a monitor that lowers or rises after installation; the article was updated February 26, 2026. Follow that guidance only if you have the matching product, and check its current instructions before adjusting it: ACT AC8310 support: monitor lowers or rises after installation. Its advice should not be transferred automatically to a different arm, even if the symptoms sound similar.
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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →If a correct, gradual adjustment reaches a point where the monitor still will not stay at the desired height, do not keep turning the screw indefinitely or force a stiff adjustment. Recheck the supported load and mounting, then ask the manufacturer whether the arm needs service. A persistent droop is not proof by itself that a gas spring can or should be replaced by the owner.
What if only the screen tilts down?
If the arm holds its height but the display’s viewing angle drops, investigate the tilt joint before changing the gas-spring balance. On some arms, tilt and rotation have separate adjustments from the spring that supports vertical movement. The symptom may be described as the screen tipping or drooping even though the arm itself stays at the same height.
- Support the monitor so it cannot suddenly tip while you inspect or adjust the joint.
- Check the exact model’s manual for its tilt adjustment and required tool. Do not tighten a different joint just because it is easier to reach.
- Make only the adjustment the manual describes, then check whether the screen holds its angle.
- If the joint remains loose, slips, or appears damaged, stop and ask the manufacturer about service options.
The ARCTIC X1-3D user manual treats tilt and rotation adjustment separately from gas-spring strength and instructs users to support the monitor during adjustment. HUANUO also describes separate joint checks in its support FAQ. Those instructions illustrate why the correct adjustment depends on the model; they are not a universal procedure for other arms.
As you diagnose this symptom, watch whether the screen angle changes while the arm’s height and the desk attachment remain fixed. If so, the tilt joint is the more relevant place to consult in the manual. If both the angle and height change, there may be more than one issue; check the mount first, then follow the model’s separate instructions for spring balance and tilt. Do not use a vertical tension screw to try to hold a viewing angle unless the manual specifically identifies that adjustment for that purpose.
How do you troubleshoot sideways drift or wobble?
Sideways movement and shaking point you toward the mount, joints and fasteners, rather than automatically toward vertical spring tension. Inspect only the parts and adjustments covered by the manual for your arm. First distinguish a controlled sideways movement when you reposition the display from unwanted drift after you let go. The first may simply be how the arm moves; movement that continues or a loose, shaky feel deserves a closer check.
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- Check whether the desk clamp or grommet attachment has shifted or loosened.
- Check that the VESA plate is seated and locked as described in the manual.
- Look for loose or damaged joints and visible fasteners. Some manufacturers, including HUANUO, advise checking set screws and joints for the drift issue described in their support material.
- If the arm shakes, inspect its connectors and fasteners; Fellowes includes these in its general advice for investigating wobble.
Do not treat these manufacturer examples as permission to disassemble every monitor arm. If the manual does not describe an adjustment, or the mount remains unstable after the checks it recommends, contact the maker. A visibly damaged fastener, stripped screw or attachment that will not stay secure is a reason to stop, not an invitation to tighten harder. Keep the monitor supported and avoid using it while the assembly is unstable.
When asking for help, describe where the motion begins: at the desk mount, an arm joint, the VESA plate or the screen’s tilt connection. Include whether the movement is vertical, angular, sideways or a wobble, and whether the monitor is within the published load range. This helps separate a spring-balance question from a connection or joint concern without guessing at a repair.
When should you stop and contact the manufacturer?
Stop adjusting and contact the arm’s manufacturer if careful, model-correct adjustments fail, if any screw or attachment is damaged, or if the arm still cannot hold the monitor securely. Tell support the exact model, the display’s weight, the movement you see and which manual steps you followed. Include whether the whole arm sinks or rises, the screen angle drops, or the assembly drifts sideways; those symptoms may call for different checks.
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Ask whether the spring, joint or complete arm is serviceable before attempting a parts replacement. The manufacturer guidance is product-specific; it does not establish that owners can replace gas springs on all arms. Do not attempt a spring replacement unless the maker’s instructions or support team confirms that it is appropriate for your model. If support cannot confirm a safe adjustment or repair, do not improvise a disassembly procedure.
While you wait for an answer, do not rely on an arm that cannot securely hold the display. If the mount is visibly unstable or damaged, stop using it until the problem is resolved. Avoid testing whether it will hold by leaving the monitor unsupported or moving it abruptly. The priority is to keep the display controlled and to avoid making a loose or damaged connection worse.
What should you compare if the arm needs replacing?
If the manufacturer confirms that repair is not suitable, compare the replacement’s specifications with your setup rather than choosing by screen size alone. No replacement is a safe match merely because its plate attaches to the monitor; check the actual load range, mounting pattern and desk attachment for the model you are considering.
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- Load range: check the monitor’s actual weight against the arm’s published minimum and maximum. Make sure the display falls within the stated range, not simply below the maximum.
- VESA compatibility: confirm that the plate supports the monitor’s mounting pattern.
- Desk attachment: check whether your desk and setup suit the arm’s clamp or grommet mounting requirements.
- Adjustment design: consider which movements you need and how the manufacturer describes tension and joint adjustments.
- Support and service: check that the maker provides instructions and can clarify whether parts are serviceable.
A compatible VESA plate alone is not enough: the arm must also support the monitor’s weight and fit the desk mounting arrangement. Confirm those details in the specifications for the exact replacement model. Also compare how the model’s manual explains spring tension and joint adjustment, since clear model-specific instructions and support can help you identify the right control if a future adjustment is needed.
There is no verified specific replacement model to recommend here, so compare published specifications rather than relying on a brand name or a screen-size label. Check whether the arm’s stated load range includes your monitor, whether its VESA plate matches, whether the desk can use its clamp or grommet, and whether its adjustment style suits the movements you need. If any of those details are unclear, ask the manufacturer or retailer to confirm compatibility for the exact monitor and desk setup.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
How do I find the right manual for my monitor arm?
Look for the model identifier printed on the arm, its packaging or its documentation, then use that identifier on the manufacturer’s support site. If you cannot identify the model, contact the manufacturer with a clear photo of the arm and its labels rather than following instructions for a similar-looking product.
Can I replace a monitor arm’s gas spring myself?
There is no universal answer: whether a spring is user-serviceable depends on the arm. Ask the manufacturer whether it supports spring replacement for your model and what procedure or service route it authorizes before attempting it.
Can I keep using an arm that still drifts after adjustment?
Do not rely on an arm that cannot securely hold the display or has a damaged attachment or joint. Contact the manufacturer for model-specific advice; if the arm is visibly unstable, stop using it until the mounting problem is resolved.
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There is no universal clockwise or counterclockwise direction. Use the matching manual and the markings on your arm; some models identify a plus direction for more tension and a minus direction for less. Support the monitor and make small adjustments.
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Should I adjust spring tension if the screen tilts down?
Not as the first step if the arm stays at the same height. Check the tilt joint and its model-specific instructions, because tilt or rotation can have an adjustment separate from the gas spring.
What Allen key size do I need?
The required tool and size depend on the arm. Use the supplied key if you have it, or check the exact model’s manual for the specified tool. Do not assume a key size based on another arm.
Why does my monitor arm rise by itself?
A gas-spring arm that rises on its own may need less tension, but confirm that the monitor is within the arm’s rated load range and follow the model’s instructions. The adjustment direction and screw location vary.
What should I check if the arm wobbles?
Check that the desk attachment and VESA plate are secure, then inspect visible joints, connectors and fasteners as the manual allows. Stop if anything is damaged or the arm remains unstable; do not disassemble it based on generic advice.
The Bottom Line
First identify whether the whole arm sinks or rises, the screen tilts down, or the mount wobbles. Check the load rating and secure connections, then make only the model-specific adjustment for that symptom while supporting the monitor. If the correct adjustment does not solve it—or anything is damaged—stop and contact the manufacturer.
