One of the worst hacks I've seen so far on my machines? was my own Bally -35 board! That was my first repair! I thought I knew how to repair! Nope!!! I thought I knew how to solder? NOPE!! I had jumpers all over the place!!!
Eventually ...I straightened it out the right way with a lot of help from a fellow pinsider. I had to start all over with it. Learned how not to do some things! Also learned how to repair traces the right way!!
Another....Is the High speed cabinet I have...I traded for the machine! Excited to get a pinball, I over looked way too many things! Learned a lesson on that one! The corner of the cabinet was sheet metal on the inside, I started digging at it to find out? The whole corner and part of the side was 3/4 or more thick of bondo! They wasted more money in bondo than if they would have actually repaired it right! Not to mention the time they took to make it smooth! It did look ok from the outside! I didn't even notice until..........I got it home!