Kings and Queens, I could probably figure out how to straighten out the upwardly-warped playfield now.
Flip-a-Card, Jacks Open - played them incessantly for 20 years but still wish could have 'em back.
Centaur - never figured out a bug with it shooting out excess ball(s) at start of multiball which made me pissed at it but now I could probably lick it.
Volcano - game I bought but never really tried to fix and then sold cuz I was really in a bum mood at the time.
Four Square - didn't give it a fair chance
Jet Spin, Blackout, LOTR, STTNG, Eight Ball, Strikes 'n Spares, Bowling Queen, Doodle Bug - had them a few years but sold to make room for other games, wish I had a bigger house.
Solar City - for nostalgia, my first game 40 years ago, where I adjusted and lubed everything totally wrong, I wouldn't mind correcting all that!
So maybe 15% of games I've had I wouldn't mind having again. The rest, mehhh.