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Have spoken to my mate this evening and he's fairly confident what he's done will NOT result in the rotor nut coming undone again. He's used a special sealer / filler/or threadlock or bearing securing medium. Sorry he did tell me what it was called but I've forgotten. He also peened over a (Belleville?) washer/ spacer at the back of the rotor nut -like you do with some gearbox sprockets as well as other securing methods including using an air ratchet up to I think he said about 157 nm. He did say if this doesn't work the area where the woodruff key is worn can be built up with special weld but hopefully this won't be required.
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