Pivot bushing used in conjunction with 4322-01139-12B carriage bolt to secure the hinge attaching the backbox to the cabinet.
Specs: 1/2" shaft, 3/4" diameter head, 1/4" hex center and 3/8-16 thread.
Williams/Bally reference #02-4352.
American Pinball reference #SPC0002-00.
Chicago Gaming Company reference #PIN-02-4352.