I take it you probably have the good old Happs Controls double coin door which has the single coin mechs.
Sure, as I like the golden age!
Don't know if it is from Happ or another manufacturer, at least the coindoor I got is damn old
I'll have to find out how I get this baby to accept Euro-coins, it still stands on 1DM and 5DM.
Already found someone that had done this before, so it's just a question of time to fix this. And somehow I'll find a circuit to build the 5-times-trigger myself.