My frame of reference is a little skewed on it. It ran fairly rough prior to me changing the belt, aligning the pulleys and just generally getting the grime off of everything.

With that said, when it was running I was a bit on guard. It seemed aggressive/more powerful (but smooth).

If a neutral and a hot were flipped, could it have started and overloaded? I haven't popped it open far enough to trace the wiring, but it looks like whoever repaired it last went a little outside of the playbook. As I said, when I pulled the wiring off the on/off switch, I feel like I remember the wires being reversed but I shook it off since it had been working correctly previously. I feel like that's my last (unlikely) hope. The switch is something that feels a bit out of my depth (from what I understand). $130-150 for a new motor vs. $600 for a brand new machine feels like the impending decision point