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I've just finished to service my drivetrain and realized my cassette is (very) slightly wobbly even at the right torque. So I guess it has been for years now. The shaft is not damaged at all, just little ammounts of black paint gone at its endpoints, surely because of that.
So I think I'd need a low spacer but the thinner one is 1mm and I was thinking it was maybe a bit too much thick for my case ?!
(Pic related, cassette is a Sunrace CSMS3 and hub is FH-T780)