Vacuum belt sliding off of rotator
You're absolutely right &amp; that's what's happening...unless of course you have the wrong belt. It's time to buy a whole new Rotator thanks to planned obsolescence.

Although, I might be willing to try some sort of retainer until the new Rotator arrives. Maybe 3 screws on either side of the belt area around the rotator body &amp; far enough away as to not saw through the belt. Or, band clamps holding thicker plastic strips (sides of plastic lids or layers of soda bottle bodies) around the rotator body. A screw on guide or retainer where the belt comes out to the rotator...nothing on the rotator so you don't spend 3-days balancing out. You get the idea.