Uneven Office Chair Base
The uneven office chair base can be resolved through the following methods:
Wheel Inspection and Handling
If the wheels are uneven when the chair is placed upright or upside down, it may be due to bent or deformed wheel feet at the bottom that can rotate vertically and horizontally, or bent or broken casters caused by uneven weight distribution, manufacturing defects, or wear and tear. If the chair is placed on an uneven surface, not all wheels may touch the ground when unoccupied, causing the chair to tilt towards the lower side when sat on. If damaged wheels are found, a new set of matching wheels needs to be purchased for replacement. It is difficult to buy a single replacement wheel foot. You can contact the chair manufacturer to provide the model number for ordering matching wheel feet, or take an old wheel to an office supplies store to find a matching replacement set after removing it, paying attention to matching the shape and size of the wheel axle. When removing the casters, pull each caster out directly. If it cannot be pulled out, insert the blade of a flat-head screwdriver into the small gap between the wheel foot and the chair contact point, use the blade as a lever to operate slowly back and forth, and pull out the wheel foot by about 1 centimeter (0.39 inches) before pulling again. In rare cases, the casters are fixed to the bottom of the chair with screws. When the screw heads are visible, use a screwdriver to loosen the screws and remove the casters. Apply a small amount of spray lubricant (such as WD - 40) to each socket on the chair base. Insert the straw into the spray nozzle and insert it into each socket for a quick spray, about half a second per socket. If there is no lubricant spray, apply a pea-sized amount of petroleum jelly to each wheel axle. Use a rubber mallet to tap each caster into its chair socket. Align the caster rod with the intended base, push it gently by hand first. If it is not in place, tap the caster lightly with a rubber mallet until the rod is fully inserted into the base. If the caster design allows, tapping near the base of the stem can reduce the risk of deformation or breakage of the new caster. Turn the chair upside down and sit on it to test the new wheels. If they roll smoothly and evenly and no longer tilt to one side, the job is done. If the chair still tilts, continue to check if the seat plate is damaged.
Adjusting the Foot Function
For most office chairs and lounge chairs with adjustable feet, there is a metal adjusting rod at the bottom of the feet. Find it and turn it to slightly adjust the height of the chair feet and quickly make the chair stable.
Adding Matching Gaskets
If there is no adjusting function and a single chair foot is slightly shorter, causing unevenness, you can cut a hard gasket of the same size as the bottom of the chair foot, such as a thick rubber pad or hard plastic sheet, and place it under the shorter chair foot. Avoid using soft materials like cloth or cotton that are prone to deformation to prevent re-imbalance. For temporary emergencies, you can also use a tightened mineral water bottle cap or thick cardboard cut into pieces and compacted to pad it in.
Repairing or Replacing Parts
If the chair feet are deformed or the structure is loose, for wooden chair feet, replace them with new wooden feet of the same specifications and tighten them with screws or fix them with glue. For deformed metal chair feet, straighten them and reinforce the screws. If the connection part at the base is loose, tighten the corresponding screws to solve the unevenness caused by structural problems.
Adjusting the Base Support Points
Check if the rollers/foot pads of the five-star base are worn. If they are missing, replenish them in a timely manner. If the ground is uneven, you can place flat gaskets (such as rubber pads) under the base to ensure that the five support points are evenly stressed.
