Yes, I saw that... wondering if I'll get walnut shell media just by grinding up my own walnut shells...
Don't waste your money on a tumbler unless you plan on redoing ALOT of pinballs. Your dremel and a polishing kit will suffice for one good shape pinball.
I have a hobby store tumbler that I've actually never used. I got it for my daughter years ago but she lost interest the moment she realized it took
weeks to get polished rocks out of it.
Maybe I will just do the Dremel though. I was talking to my wife yesterday and she really wasn't pleased with the idea of another project where a machine was taken apart for two months as I took my meticulous time, so I probably won't be removing all of the components, just doing whatever I can do by the end of this weekend.
Right now I'm trying to think of what to do about the cabinet. The left side is far worse than the right, but fortunately that side will be facing the wall. I still want to protect it though. My initial thought was to protect all the stencil work and just repaint the off-white, but then I'll have to redo the silver splatter as well. Hmm.
I also am not sure what to do about the back panel. At a minimum it needs to be repainted, but I'm wondering if I should replace the water-damaged panel with plywood or maybe just attach luan to it to re-face it before repainting it.
When I get home tonight I'm going to triple-thivk the backglass. There's only one part of the lass I think I should attempt to restore; if I tinker with anything else I'm liable to just screw it up.

This guy's collar is almost completely gone, so I don't have to worry as much about color matching. This is the worst of the backglass flaking.