I finally got around to looking my flippers. They work OK but I thought them to be a bit weak. The sleeves were very dirty, as expected. The stops mushroomed. The ends of the plungers were damaged, as expected based on the stops. I noticed that the plungers had a flat spot almost the complete length. None of the other flippers on other machines I have rebuilt have this. Is this something unique to Sega machines?

I apologize in advance as I'm sure I read this someplace and can't find it. Rebuilt flippers on High Speed. Occasionally, not often, the right flipper hangs in the "up" position. If you hit the flipper button quickly a couple of times it releases. The last time it happened, I let the ball drain, flipper still up, then turned the machine off and it went down. If I remember what was said before, that indicates an electrical issue. What am I looking for to adjust?

Good deal. What should we check for?

Sega Lost World, left flipper goes up then comes back down immediately with flipper button pushed in. This continues for a couple of minutes then seems to correct itself. So electronic and not mechanical I assume. Rather than tearing stuff apart and guessing, I thought I would go to the experts.

Fixed. Someone changed the flipper button to one that was longer. He had to bend the switches to fit. Replaced it, as I fortunately had extras, straightened out the switches and it now works as it should.