So, the first thing I did when I saw it was grab the speed dial and run it up and back down without the machine on.
Then I read the manual and realized my mistake.
Got the motor case off so I can oil and check bearings and general operation, when I found the damage to the belt as shown in the photo.

Should I replace it?
The bearings seem to be in good shape. There is plenty of motor noise, but my question is about the slight bit of metal rattle. It goes away at higher speed settings. Just part of these motors, or something that needs to be addressed?
Here it is running at low speed: https://youtu.be/itN3HsBUyJY Couldn't adjust the speed because my other hand was holding the phone.
Resting my hand on it, I feel surprisingly little vibration at any speed.
Lastly, this bearing seems fine, and the grease is still soft enough to easily mush around with a finger tip, but I thought I would throw it up here in case I am overlooking anything.
