This metal nut secures the flipper button to the cabinet and the *action* button to lockdown bars that use them.
Williams/Bally reference #02-3000, #20-9222, and #3A-7532.
Stern reference #240-5003-01.
Gottlieb reference #24293 and #21972.
JJP reference #91-000001-10.
American Pinball reference #NUT0001-00.
