A new wobble is worth investigating before it becomes a fall. Do not keep using an unstable chair while hoping the movement will settle. Move it out of normal service and identify whether the problem comes from the floor, a caster, an external joint or a part that should not be adjusted by the owner.
Start where the chair meets the floor
Inspect the floor or mat for a ridge, an uneven join or something caught beneath a wheel. Check the visible casters for debris and obvious damage without putting your hands near moving pinch points. Use the manufacturer's method if a caster is designed to be removed or replaced. Do not force a fitting simply because a similar wheel on another chair pulled straight out.
Look at the base for cracks or deformation and at the seat and back for visibly loose or missing hardware. A photograph taken before any permitted adjustment can help you compare the arrangement with the assembly diagram. Keep the chair supported safely while inspecting it; do not balance it in a way that could let the heavy base or seat fall.
Limit adjustments to the assembly instructions
Some chairs permit periodic checking of accessible assembly bolts. Use the correct tool and any torque or tightening sequence given by the manufacturer. Tightening everything as hard as possible can damage threads or components. If a fastener turns without securing the joint, the problem is not solved by more force or an unrelated replacement screw.
Do not dismantle, drill, heat or attempt to repair a gas-lift cylinder. Do not improvise a brace around a cracked base or bypass a tilt mechanism. These are load-bearing parts, and an uncertain repair is not an appropriate way to restore a chair that supports a person.
Give support a clear description
Find the model label and purchase details, then describe where the movement occurs: at one wheel, between seat and base, or in the back connection. Include photographs of visible damage and the hardware already checked. Ask for the correct replacement part and installation procedure rather than buying a component solely because it looks similar.
Return the chair to use only when the fault has been resolved through an appropriate procedure and it is stable in its intended configuration. If the structure is damaged or suitable parts are unavailable, replacement may be the sensible outcome. A chair does not need to look worn out before a structural problem makes it unsuitable to keep using.
