This is all pretty standard stuff on a 33-year old pinball machine so don't sweat it or decide you need to go all intifada on the seller. Just address the issues one by one and you'll be ok.

The cabinet wear and the playfield wear is simply the cost of doing business and it shouldn't bother you. If you don't want any of that you need to buy only brand new games.

I had this exact problem on a pinbot. The screws are aligned correctly but it won't fall/settle that last little bit. As described in his response that seems to be the issue - he can push it down with his finger and it settles where it should.

I honestly don't remember how or if I fixed it, this might have been 15 years ago. I'd start by cleaning everything, to make sure no schmutz/dirt is making the visor stick above the playfield. Anywhere there's plastic on plastic/metal contact, make sure it's nice and clean.

beyond that make sure everything is aligned correctly. May have to take the mech apart.

Can you guys be a little more specific where this bushing goes? Mark up a photo maybe?

great thanks !