I have a couple friends that built their own from scratch. One guy used a worm-gear drive with a crank handle, then a chain and sprocket reduction to turn it over with. It really works well, and with the worm gear, it stays in whatever position you put it in, as the worm gear, (theoretically) will not creep. It does work. My other friend used the rear wheel hubs off a front wheel drive car, a Dodge K-car, I believe for the bearings on each end. They were free, and the only problem he faced was to spot-weld the bearing housings in so they would not pop out. Both work very well. John V.O.