When I built my home 35+ years ago, I purchased a Oliver OC-3 tractor / bulldozer. It was a partial build by Oliver, and delivered to the dealer in Massachusetts, Boston Tractor, and they completed it for grading the slopes on the Interstate highways that were being built. It had a very wide track for stability, but it was next to impossible to keep seals in the final drive. There was an old fellow locally that had a lot of NOS parts for them, and he also had a number of parts machines in his yard. He also had a full machine shop in his backyard to rebuild parts. He was a retired machinist at Pratt & Whitney, and a master at his craft. He built a 3 phase converter to run the shop, using an old 10 HP electric motor, and powered it with a 3 HP 110 electric motor. He explained how it worked, and I remember him telling me that CL&P (Connecticut Light & Power) didn't approve of what he was doing, but when the "inspector" retired, he asked him how to build one for for his woodworking shop. I can still see his shop in my minds eye. I am now older than he was back then. Somewhere in the cellar, I still have the manuals from that old machine, along with the manuals from my old Minneapolis Moline.