Ok *sigh* so the insanely expensive Hope hub I bought to build my own rear wheel wasn't indestructible after all. The cassette now spins freely both forwards and backwards, and it's not because it's frozen. I took the wheel indoors last night and it's just as bad.

So - can I remove and overhaul or replace just the cassette body (i.e. the thingy the cassette slides onto)? I've been looking for tutorials, but so far only found one that mentions cup-and-cone hubs. I've overhauled those before, but not just the cassette body, and I've not removed a cartridge bearing yet (well, not from a wheel, just from a bottom bracket).

Any tips? I'll do some more searching, but I figured I might as well ask here first