[Nathan Kroll]

I know that Beatty and Hamond has had the fisher price gearboxes on their robot for a few years now (I am pretty sure that they are unmodified internally). They havent seemed to have any problems with it (actually there drive trains has proven to be one of the most simple and reliable I have seen). Mabye you could try and contact them. However my previous team modified the gear boxes and had some trouble with the plastic gears chipping. Nothing that couldn't be prevented with some moderatly careful driving, no jerky forward to reverse movements.