Bell Armature Plunger Assembly Williams/Bally #02-4668
Use Screw Bally/Williams #4106-01152-06 to secure cap to plunger
Use Williams / Ballly ball popper cap #03-8561
Used on the following games (may not be a complete list)
Creature From the Black Lagoon
Congo
Flintstones
Judge Dredd
Twilight Zone
Theatre of Magic
White Water