It was just luck I found mine got one in a trade then months later I got the other one..So all I can tell you about that is go the every Tank site you can find and put up an add.Plus No problem just trying to help.You know the "stop and spin" like the DMD tanks is cool and all thats about it.If I had someone to cut me some good gears(Brass,aluminum or steel)I would go back to the single gear drive.