nintendo mechs are a little different than most. i successfully modded mine to accept steel washers i have been using as tokens, but now they dont work with quarters. the way they are designed, it is difficult to make them work with different sizes of coins. they have a little rail that the top of the coin needs to ride on..it has to be adjusted for a specific size of coin, if the coin is too big or too small, it just won't go through. there may be a way to replace that piece with something else in order to accomodate that, but using the standard parts, it is difficult.