Our heavy duty chair mechanisms come complete with 1″ threaded post, small #74 bell and washer. The 13-1/2″ mechanism comes with a 4-1/16 bell.  Customers can order other bells as an “add-on” feature but it will not arrive pre-assembled.

Available Sizes:

• 13-1/2″
• 15-1/2″
• 16-1/2″
• 17-1/2″
• 18-1/2″
• 19-1/2″