• Bought a campag cassette and in addition to the lockring it came with a very thin skinny flat washer thats lockring sized, theres no way that goes between the lockring and freewheel body is there, as I thought (new to cassettes) that this was an interference fit with the two knurled areas on top of each other. Would the skinny washer slide on the freehub first, or should I forget it ever existed. Cassette is a 12-21 9 speed. Cheers all : )

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