Actually, I'm no expert, but I have been researching this exact thing, and from what i've learned, almost every single coin mechanism out there can be configured to accept either. It's just a matter of figuring out how yours switches between the two. Some have a simple switch on the back, some actually have a spot to place an example coin, and i'm sure there are other ways. See if you can obtain the original documenation for the coin mechanisms or the game it originally came in for specifics. Or just poke around on the coin mechanisms for a switch.