In reply to The Purple Pimpernel:
But the bolt always was garbage, I know people did fall on it and got away with it but really it was one of those where you'd never have full confidence, rather like the stub now? In some ways threading the stub might be better as the old bolt was one of those with a big screw on eye which a)Might itself break when rusted, b) Provides more leverage than putting a wire over the stub whihc, presumably, is u close to the rock. Also no there is a (apparently, I have no personal experience) a lower insitu thread to pack it up which was not there when the bolt was.