Hardware question regarding coin and headstock door locks. A few years ago I disassembled my KISS (Bally) to rock tumble all the parts. However, since that my coin door lock mechanism doesn't "hold" position with key in. Usually, the locks have that "click" and stay in a closed position with the key in the lock but I'm finding that if I have the key all the way in the lock, the position will turn/sag without any resistance or the click. When I pull the key out just a bit or key out completely the lock works as it should. I'm wondering if I'm missing a part of the mechanism after the rock tumbling I did or what would cause that.

I think my issue is different as I know my other machines coindoor lock will click when the key is in position to take the key out. Right now if the key is in all the way, it will turn freely. The mechanism for locking and unlocking works just fine, it's just that I have to pull the key out a click if I leave the key in the lock while locked.

The lock mechanism works as it should with rotating only 90 degrees to open or closed, it just doesn't have that "click" to hold position. When I put a key in my KISS (Stern) for example, there is a click when key is in position to remove so the cam doesn't just swing open and closed 90 degrees one way or the other even with the key in position. So there seems to be something missing in my KISS 78 lock after disassembly that doesn't click into that holding position.