[rrobson]

Apologies, I’d somehow presumed you were talking front…

The “stub axle” is part of the trailing arm assembly. I don’t believe they’re are serviceable separately and would require a replacement trailing arm. New they aren’t extortionate if available but a second hand assembly would be the way to go. I can’t see the threads being worn though, a tired wheel bearing wouldn’t damage that part. I’d have to look myself to determine whether it’ll go again or not, certainly isn't a 5 min job to swap a trailing arm over…