Start from scratch. I had a new shaft machined by a local shop-with a friend’s guidance. Then we ordered the gear assembly/motor.
We trashed the big plywood disk and went with a small dc transformer. It works well. My next moves will be to finish paint and weathering, get a new controller and be done. It operates well but getting the tracks in perfect alignment requires a “soft touch” with the transformer.
Budget:
Shaft. $5; gear/motor $92; dc transformer $1 ( train meet).