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 $29.05 Gives extended height ability while keeping 3" of unthreaded portion in hub for stability.
Uses 83B thrust washer only.
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See Tips for installation help
Why 3"?
So that 3" are in the hub providing stability and strength