Williams / Bally white plastic opto interrupter used on flipper cabinet opto boards 5768-14577-01 in conjunction with a blue flat steel spring.
The preferred replacement for this white factory interrupter is the black plastic 03-9001.
The white plastic occasionally causes flippers to stick because of the translucence of the white plastic.
Reference:
- 03-9001.1
- Replaced by 03-9001 black plastic