Just wanted to write to say that this thread is spectacular.
I am having the same problem with left/right canting and gear-slip on my mini-playfield and discovered this thread yesterday afternoon.
I decided to go the route of the JB Weld fix last night on the gear and arbor.
It's curing at home right now and we'll see what happens come 9pm Pacific Standard Time.
Outside of the Bally manuals and Faz's pdf, this thread is right up there with all the information and pictures necessary.
Yay.