Quoted from PinballAir:
Anyone have trouble with LEDs being too tall for the pop bumpers.
Did a full rebuild with everything new.
The 555s fit fine. The LEDs fit in one but not the other two.
All light sockets are the same.
I suspect 2 of the bodies are shorter than the third. One is bright white and the other 2 are not as bright.
Are there 2 heights for pop bodies?
Use bulbs without the dome or bend the socket slightly to the side so they fit.