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I knew Campagnolo changed the freehub 'spline profile' around 8-9 speed, but didn't realise the lockring size was changed too. Having said that I would have presumed if my sprockets slide on fine then the lockring would also be okay, but possibly not. Andy if you do have anything I'll be eternally grateful and will happily swap mine for it out of principal.
So the cassette slides on fine, but the lockring is ever so slightly too big and isn't taking onto the thread of the freehub. This seems odd as I'm confident the hub is a Chorus 9 speed and this is my lockring.