✅ SOLVED Knob of some sort?

[cudamark]

Found at an old home site. It says "New" on one side and "Worn" on the other. The hole on the back side appears to have a flat side, so, Probably fit on a shaft that turned. I'm trying to think of something that would need a special setting between new and worn! Any ideas?

 

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[cudamark]

Oh. I'm plenty old enough The only vacuum I've had with a power brush is a Rainbow unit, and it doesn't have a goofy setup like that.......at least, not that I'm aware of. Never needed to adjust for a worn belt yet.

 

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[Bigcypresshunter]

I cant find a pic but im sure because I replaced many of these belts. Its the metal end cap shown here but its hard to see with lint and thread wrapped on it. Also may be have a bearing and I even searched the model number in the pic but they seemed to have done away with the new/worn feature on later model end caps.