OP, i’ve been in the same boat. I acquired my games quickly looks like you have 7 and I only have 5 but I knew nothing about fixing them but probably like the tinkering aspect more than playing. Only had one new in box Stern but I never had any problems with that. I’ve bought and sold etc. That’s why I’m here on a daily basis to educate myself and ask questions when needed the community has been invaluable but I do sympathize with having to spend 10,500 on a game and then having something not be perfect but I get it now even moving them 100 feet, things shift loosen etc. Hell the other day I was playing my Lebowski after it traveled 800 miles in a van and I heard a screw fall onto the bottom of the cabinet while I was playing. Most everything for me so far has been an easy fix but again I have my local community and Pinside at my disposal if needed.