just got my wavey disc through. read somewhere you can "wiggle" them off without removing hub assembly etc. this to my amazement i managed to do. but when it comes to putting it back on it seems nigh on impossible. there must be a knack? i cant even get the std one back on.

Keep trying its like a frikking jenga puzzle sometimes, you will get it in the end.
I ended up tapping mine with a nylon hammer which worked.