My 1974 Top Card has the latch relay. Might be the first game to have it?? I like that you can adjust it and if the tips of the latches have any burrs on them, sand them smooth. But, if I don't play the game for a while I sometimes have to manually trip it to complete the reset sequence the first time I start it up. Otherwise, I think 70's single player Gottlieb wedge heads are the "easiest" games to repair...as long as they're not a hacked mess to begin with. Right now I'm finishing up my Bally Centaur with its unique trough design , overly complicated coin door and strange pop bumper assemblies. If I didn't love the game so much...