Hub thread problem

Are you sure that the threads on the lockring are ok (all the way round the hub?). If they're gone the cog would just uncrew the lockring, and I wouldn't ride that hub anymore.

(Oz is talking about locktite, I wouldn't consider it sufficient to use on a hub with an undoing lockring that you need to use as a brake)

I was describing how much to tighten the sprocket if you don't have a chainwhip.