Swivel Chair Replacement Parts
Measuring-Precise length measurement or removal is not necessary. Do not include the activation button nor the pencil sized piston rod protruding from the bottom center when measuring. Only measure the "body" length. If cylinder has not been removed from mechanism, add 1". You can also select a length according to your height.
A Standard size Gas lift Cylinder is 1.102". For quick reference, it is a little over 1 1/16" and a little less than 1 1/8".
Gas lift Cylinder Removal
Tool required for Installation-None
Begin by laying front of chair seat edge and top front edge of back onto workspace. Remove base with castors by removing base retaining clip 
and washer 
located in the center underside of the base. Slowly withdraw the base from the lower portion of the Gas Cylinder and set aside. (several loose parts may remain inside after withdrawal which must be replaced in the exact order as removed). A 6 pc. replacement Bearing kit [#108] with installation diagram is available or print this if parts are in good condition. To inspect, make certain the Rubber bumper is not worn out or broken, The Bearing race is not broken, and washers are not groove worn. This pre-inspection is often overlooked when ordering a cylinder and too frequently results in a "help" phone call delaying installation and unnecessarily increasing costs. A #108 kit shipped separately does not meet our $20.00 merchandise shipping minimum requirement.
While the mechanism is still tightly attached to the bottom of the seat, place pipe wrench on main body of cylinder nearest to the control mechanism to "twist" cylinder in either direction to loosen and remove. (In some cases, the mechanism may have to be removed and placed into a vise for cylinder removal) The cylinder is not screwed on, it is only a "taper" press fit. Removal will be made easier with a squirt of WD-40 at the entry point of the gas cylinder into the mechanism. Strike the cylinder 2-3 times near the entry point with a hammer which will vibrate the cylinder allowing some WD-40 to penetrate. Then allow a few minutes soak time.
Note that "Pipe wrench" removal will permanently "scar" the Gas Cylinder body with the wrench's jaw teeth. If the cylinder is to be reused, these raised metal scar marks must be removed by filing or sanding reasonably smooth so as not to cause premature wear of the plastic cylinder liner or cause stickiness during normal operation. Thus the reason for placing wrench close to control mechanism, as that portion of the cylinder does not affect the plastic cylinder liner.
Another method is to use a Lift-Off® removal tool which can be economically rented or purchased.
Caution! The gas cylinder is under pressure and the wrench may cause a puncture permitting the pressurized Nitrogen gas containing a small amount of oil to escape. Wear EYE PROTECTION to be safe from any injury. One "puff" of escaping gas can be expected if punctured.
Warning: Under no circumstances should a Gas Cylinder be activated, tested or operated prior to completion of mechanism and base installation. Gas cylinders have been tested prior to shipping and are not returnable!
Installation
Installing a Gas Cylinder is accomplished by simply hand inserting the Taper end of the Cylinder into the Mechanism. Install small parts per schematic, lightly greasing the bearing. Wipe off greasy hands on the cylinder. Turn the chair over into it's normal use position. Sitting on chair once or twice is enough to make the tapered joint fit unimaginably tight.
