Having some issues with my MA 800 coin mech (on a vacuum) and looking for some advice on how to diagnose/fix. I first had an issue with the inlet rail jamming up with quarters which started with one or two getting stuck in the mech itself and backing up into the upper slot. I cleared that and tested with multiple quarters finding that most were not being accepted and going into the return slot (probably 1 out of 5 making it through and being accepted). I noticed that the front portion that swings out was not that tight to the rest of the mech and if I held the two halves tight with my fingers it accepted most quarters then. I removed the cover on the swing out portion inspected and re-installed and it now it closed tight and seemed to work normal (problem solved...so I thought at the time!). I have since had it jam up again and wonder if this is a common thing or if there is anything I need to adjust/clean/replace to get it back working properly. Thanks!