Finally got to contact Bushton and their answer was:
"Unfortunately, you would need to take your motor to someone local to have it looked at. Your saw would have an old FASCO motor, which is AC, and we only deal with the DC ones. Chances are that they just need to take it apart and clean it up well. I'm so sorry we can't help with that."
I'm admittingly disappointed in their product support. I don't know much about small electric motors but I don't understand why they would be able to take apart and clean a DC one but not an AC one. Not sure where to go from here.