Hey Alfie,
I have a unit with the gears from a 1992 bike that I replaced a couple of years ago for a 40 amper. It had developed a fault that burned the voltage rectifier. I've been keeping it to play with on a rainy day but can't see that happening for many years yet. So, pm if your interested, how does $5 plus you pay for postage sound. Beware, it is a very heavy unit.
Regards