Enjoying this thread... I've always had a thing for the Duo/Magnotron machines. Magnotron was one of the first machines I played (and got good at), partly due to the low threshold - it was set to replays at 34000, 48000 and 56000. Also, specials light after hitting the ABC rollovers. Didn't need a lot of quarters to play a lot of games.
Best of luck with the restoration!