Gil mine had a little scoring of the cylinder also but I just put new orings in and it was fine. I think the orings get hard after heat and start to loose elasticity. Mine actually sounded squeaky like tennis shoes on a wood floor when turned slowly by hand. It caused it to hit more often and tried to stall. The new 20mm x 1mm orings from oringsandmore.com quieted mine completely.
Thanks, Tim. I just ordered some 20mm X 1mm o-rings.
Until they arrive I removed one of them. Mine squeaked too!
They squeaked from the very beginning.
Gil
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