AU3 front hub removal

[kcej]

I'm going to be removing my front hubs due to wheel bearing noise

I've read the GREAT how-to by ronwest, but one thing still bothers me

The hub nut with the strange (lock?) washer (that wraps around the nut) pictured below...(The bit I put RED LINES on)

Do you just use a socket that fits over the whole thing? or do you need to remove the outer casing pictured?

Also, is this nut re-usable, as in ronwest's pics it appears he has reinstalled the old nut with a new hub

any help appreciated thanks Keith