The machine is located in the bookstore of a high school. I don't believe there has been a problem with the cashier supplying quarters to the kids, however, I figure if they get change for a dollar, only one or two quarters would probably be used to play. The other two might not be spent. If they put in a dollar bill into the machine, they have to spend the whole dollar.
Alternatively, I could set the machine at one play credit per quarter or, as an incentive to spend the whole dollar, 5 credits per dollar.
I spoke with people at Betson and they said it could be done with any door, but we would probably have to drill out a larger door into the cabinet (which I dont want to do). Mounting something to the side of the machine also is not an option.
Really the only way I see this happening is if I can find a dbv capable door that will fit in the existing hole in the cabinet.