Can't remember, did you mesh mod them?
I had the same problem with mine. Noticed the magnet of the impeller wasn't perfectly cylindrical after about 2 years. Who knows, maybe it would have happened anyhow eventually and just the meshmod sped it along or maybe it was just the meshmod that contributed to the uneven wear and tear.
Anyhow if that's the case you may need a new impeller.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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