Hey I just picked up a TSPP and I wanted to get some more snap in the flippers. So I read some articles and thought I could fix them up no problem. I took my flippers apart and grinded down the slight mushroom off of all the plungers with a dremel and did the same with the coil stop. I didn't grind much, they weren't to bad. I also put in a couple new post sleeves and cleaned the other 3 with alcohol. Also sanded the plungers slightly with 400 grit. I did all of this before to my POTC and it turned out great, all but the alcohol. I'm wondering if the alcohol gummed up the plungers. Anyway, I believe the coils are straight and the plunger is sliding like it should. One of them might be a little stickey (lower right), but not to bad.
Also, I noticed my lower left flipper does not have the plastic piece that bumps into the switch. I don't know if this just happened when I was working on it or it was like that. I know it needs to be fixed. See picture to help describe the part.