Sorry to be a negative bugger, but the tail shaft is case hardened. That might be a weak point now.
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Craig, fair point but I would doubt there was much sustained heat, more abrasion over a 3000klm period at times. I put a vernier over the tailshaft unaffected and affected and its less the 0.005" loss of diameter - not much from a torsion perspective, but I will remember your words in the future if it lets go!