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I have had my tormek grinder for 8 years and have used about 5-6 stones in that time. My latest stone which is about 4 months old (now about 220mm in diameter) is starting to become non circular. This has never happened to me before on previous stones. The stone is about 5mm out of circular. It appears to have a bulge on one side so as its rotating, the stone appears to rise and fall as if it is not mounted through the centre of the stone. (Im trying to be as descriptive as possible so you can understand what I'm talking about)

I suspect it's got something to do with the rubber drive wheel although as its running I can't see any movement in the drive wheel.

Has anyone else experienced this?

Thanks. Paul