I'm working on a Mills Bonus Horsehead slot with the cheater mech that only allows B-O-N-U-S letters to be achieved every other play. It works correctly and I have no problem synching up the letter mechanism so that the B comes up when the first reel says B etc. However, periodically, the unit goes out of sync and the O for instance might award an N instead of the O. When I follow the procedure to get it back in sync, it will play correctly for a while and then go back out of sync.
I'm assuming the letter wheel with the notch in it is slipping somehow and causing award of the incorrect letters. Not sure how that wheel is supposed to stay in place and not slip. Anybody smarter than me who can give me some tips on what to look for? Thanks!!