Hi David,
I have the same saw that I also recently acquired. My saw was making a bad clunking noise. Upon examination, I found that the motor pulley had been installed without a key in the keyway slot. It had been operated that way and the pulley was badly worn on the inside, the motor shaft was also damaged. Not having access to machine tools I decided to have a machine shop do the repair. It entailed reboring a larger hole in the pulley, truing up the motor shaft and then making a sleeve to fit the two together. I just picked it up yesterday and I can provide you dimensions after I get home tonight. Let me know if you still need them.
Flip