So, washed my bike finally on Wednesday, chain off, wheels off, proper clean. However in cleaning the cassette and wheel I think I must have disturbed some muck around the inside of the lockring.

Currently there is a nasty intermittent noise from the rear hub. Goes away for long periods but then comes back and stays for a while. Sounds a bit like osmething floating around inside.

The bike is 9 speed Campy Mirage throughout, but I don't know about the hub (or freehub) itself. Is this likely to be genuine Campy aswell? (bike is a Decathlon, 7.4?, either 2004 or 05, not sure).

So wondering about how to deal with it. Is the freehub serviceable? or at least removable and then cleanable? Just about to order the lockring tool, do I need anything else?

Thanks for nay help
Joe