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@worrywort
about six months ago, I fitted a 17 tooth miche sprocket which i purchased from wiggle. this has a two part ring and sprocket. the ring screws onto the hub and the splined rim locates in the sprocket. The other day I noticed the lock ring was loose.
This was caused by the sprocket moving about because the ring is now a dick fit.
the fucking thing could have killed me. I've now got a lovely new one piece one from HUBJUB now.