Not a expert but if I snug up those bolts it also stops the saddle moving on my lathe. I have a background project to make shims so the bolts can be tight.
Gary
Yes took apart the spindle, not really that big a deal. Used it as a opportunity to clean the oil wells and the thrust bearing. Runs like a champ and is great to have no more slipping belt.
Gary
The one I bought is 7PK1272 it is just under 1 inch wide. I measured the existing belt and went to NAPA and found a length that was close. Please don't use the length I chose without checking because my motor installation is not the standard.
Gary
My lathe is a 9c they are great teaching tool. I just recently replaced the belt with a serpentine (automotive alternator) boy did the lack belt slip change things, I also made a er32 collet chunk that threads onto the spindle.
That's how governors work on lots of small air cooled engines like Briggs and Stratton.
You could put one on your fan cooled engine. Another opertunity to select the perfect spring.