At last all the final parts have arrived. The dynamo rotor is held in place via an M7 x 35mm left handed bolt that goes into this threaded hole. I liberally greased the brand new replacement bolt, the old one had crossed threads, and gently screwed it home by hand. The moment I applied gentle pressure to tighten it it span loose. The bolt came out with the same crossed threads as before. Inspection of the bolt hole shows the threads are chewed up. Curses. Next plan is to re thread the hole to M8 and standard metric M8 bolt. So the hunt is now on for a correct left hand tap and matching bolt.
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