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.
threaded-manual_post_11_inch
See Tips for installation help
Why 3"?
because 3" remains in the hub providing stability