Just a quick update - Bojan's had a look at the lens and his magic tool isn't able to straighten the thread. When the lens got dropped, the impact both bent the threaded area and squashed the threads, so rolling the dent out will not restore the thread.
My option now is to perform surgery on the lens to remove all the internals and then have the lens body machined down a bit to remove the damaged section.
This will also give me the opportunity to see if any of the internals are out of position and hopefully restore the optical qualities of the glass and mirrors.
This is another job on the 'To Do' list...
Cheers,
V.
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