[Bruceb]

You have several Fisher Price gearboxes. They all have gears with various reductions. We are using some of them with a 550 to get the necessary reduction we are looking for. With careful measuring and maybe a couple trial and errors you could probably use a drill press to make a gearbox out of some of them. I think the first stage is something like 7 to 1 but count the teeth and find out. Hope that helps.
Bruce