Threaded Post replacement for manual mechanisms
Swivel Chair Replacement Parts

Steel Acme threaded replacement posts

Threaded Post
#81E 1" x 8" of threads, plus 3" of unthreaded $29.55 Gives extended height ability while keeping 3" of unthreaded portion in hub for stability.
Uses 83B thrust washer only.
See Tips for installation help
Why 3"?
because 3" remains in the hub providing stability