This may have been asked before. I want to make my Bally Star Trek coin doors to take quarters and free play. I have figured out the free play part. I just can't make it take quarters to play. The Bally Playboy were no problem turning them into free play and quarter play. And, the doors and coin mechs look to be one in the same. I just can't figure how the Star Trek coin mech is just that little difference from Playboy. I'd like them all to have free play and quarter play before I sell them. Has anyone had this problem with Bally Star Trek not taking quarters?