Figured I'd see what other things other guys out there keep goofing up when working on machines. We all have our little foibles, so let's have some fun with them. For me, the two most common ones I do that drive me nuts are these....
1: Flip up a playfield, without forgetting to take out the balls first. Thankfully I haven't broken anything yet.
2: Older solid states, I keep putting the heads on with the power cord still inside the cabinet. So I have to take the head off again to get it out.
What about you guys?