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Cheers for that, that's what I had guessed the process was. Reassuring to hear that it's not too complicated a task!
@Eseman, thanks, I'll check them out.
You can get a helicoil repair -new threads cut to a larger size (usually 5/8ths x 20) and a threaded bushing with an interior 9/16th x 20 thread fitted.
This is a dead common repair any proper bike (repair) shop will do it.
Cranks need to be solid aluminium alloy (or steel 😉)