vid1900 - I know it's been said many times, but your tutorial was indispensible for my pop bumper rebuild on SM! Thanks so much for spending the time to help the community. My pop bumpers are rockin! I would have never had the confidence to take this on blindly... (nor know about polishing the rings, etc...)

Now for the embarrassing part: I had 2 screw left... Not good. Still trying to track down where these go. (Pretty sure they're not part of the pop-bumpers, but something else i needed to tear down in the process. The joys of being a pinball newbie!!!

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Yes, apologies for being vague. Stern Spiderman. Agreed, I don't think they're from the pops. I'm beginning to think it's a coincidence. Is it possible the switches for sandman just need to be replaced?

Looks like it was the optos up in the sandman area. A light cleaning has greatly reduced the frequency. Need to find the time to do it properly... Thanks for the advice!