Just completed the conversion of all of my quarter coin mechs to accept tokens. Cadillacman on the KLOV forums wrote up a good tech article, and Jeff Rothe cleaned it up and posted it on his blog Here It was interesting to note that although Cadillacman only shows 3-4 types of coin mechs (there's a lot of different types) I was able to use his information and convert all of mine, I have about 6 different types of Mechs. Quick addition to his info... Asahi Seiko mechs, as used in some nintendo cabs (punch out, playchoice, etc) are almost identical to the newer version of the Coin Controls mechs. Coin Acceptor inc also makes a few types of these quarter mechs, the metal ones are similar to the old style coin controls and the plastic ones are similar to the Happ mechs.
I have a lot of 500 tokens on the way from Steven (Noice87 on Klov) at Token Warehouse that are shipping out tomorrow. All that's left is to get a bill changer machine that dispenses tokens...