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@willski
I have a miche quick change sprocket with a dura-ace lock ring on a System Ex hub. There shouldn't be any appreciable play with the lock ring tight. Is it the threads on the hub?
The drill for removing the sprocket carrier is; loosen the lockring half a turn, loosen the sprocket half a turn with a chain whip so that it tightens against the lock ring, repeat this process until the carrier is loose enough to unscrew by hand.
It's a bit tricky, but you shouldn't need to do it often, as the carriers last ages.