not to beat a dead horse (and not that I have a horse in this race), but I'm not buying the answer that it would be too difficult (logistically) to put in the coin mechs due to different currency types.
the coin size validation type mechs simply use a screwdriver to adjust the mech to accept the proper size coin. (phillips screw in the middle of the mech image that Rarehero provided above).
a simple one-sheet on how to adjust the mech would be sufficient for those wishing to use them. or rick could include a $10 roll of quarters with the machines to international buyers 
Bristow, VA
