Office Swivel desk chair Mechanism part
Manual conical spring type
Low profile
Noiseless bearings
Easy to adjust while seated
Large forward tension knob
3" post bottom unthreaded increases base stability
Older style manual mechanism
Large spring adjustment knob
Manual Post height 8 3/4" overall for base stability
5 3/4" x 6" or 5 3/4" x 8" mechanism attachment slots