Quoted from o-din:
Interesting as PBResource shows Williams used the same rod and ring on all their games from the 50s until the end and that is what I have found while working on them.
As long as the unthreaded part of the shaft is the same length, it should be OK. I don't know what the other one in the video is he is talking about as those Williams ones are pretty much generic replacements for most pop bumpers.
I got a lower right pop bumper switch error about a week ago that started this whole ordeal.
When I lifted the playfield, the metal yoke was broken. I've replaced these before on my BOP so I'm familiar with the process.
Weird that the old pop bumper ring assy had both ends where the threads are partially sheared off. I found the two washers on the cabinet floor but I must have looked everywhere for over an hour and couldn't find the (2) lock nuts with parts of the threaded shafts in them.
Looked under the transformer wood shelf, in and ouside the speaker magnet, on the magnasave magnet, in the wires, everywhere. I'm thinking this pop bumper has been kinda free floating for years without locknuts. The remaining threads on the old ring assy are practically smooth.
I tried the game out 20 minutes ago and I can see an amazing difference when the ball enters the pops area now.
Thanks for you input on this topic.