I've also had a few bolts come lose and fall out which isn't really a problem in home use since you notice it pretty much right away and can fix it immediately but it is super annoying when your in the middle of usually a good game and the flipper stops working or one of the trolls gets stuck. I think CGC should invest in some locktite it really doesn't cost that much and would save a ton of problems especially for op's that aren't there to catch the problems right away.