Originally Posted by hueyhoolihan

if the individual cogs are moving on the freehub body, and the lockring is tightened down as it should be, i would remove the cassette and inspect the freehub body and cassette, possibly the splines for damage, if all looks well and good, i would reinstall it and check it again for cog movement. if it still existed, i would assume the lockring is bottoming out on the end of the freehub body before it tightens down on the cassette. then remove the cassette and install spacers or additional or wider spacers behind the cassette. if the cassette's smallest cog is a 12t you might want to double check that the lockring is not designed for an 11t small cog. i know that at least one aftermarket alumuinum 11t lockring can distort when overtightened on a cassette with a 12t smallest cog.

Originally Posted by Jed19

I think you need the Mavic spacer in first, followed by the Shimano 1 MM spacer that always come with Shimano 10-Speed cassettes, then the cassette and the thicker Shimano inter-cog spacers in the appropriate order, then the lock ring tighten to spec.