A wobble in a chair can be caused by a faulty control mechanism or chair base. To fix the wobble it is important to verify which of these is causing the wobble.
•    Control Mechanism: With the base of the chair set on the floor, pivot the seat from side to side by alternately putting pressure on the right, then left side of the seat. If the seat “wobbles” where the pneumatic cylinder and control mechanism join, the control mechanism is faulty and may need to be replaced.
•    Please locate the serial number on the sticker located on the underside of the seat and contact the original purchasing dealer.