I might be being dim here, but what is the damage supposed to be?
The thread is worn out and damaged, hence the left crank fell off on it's own accord whilst cycling. I took this into a cycle shop and the worker upon inspection said the thread is damaged because it would not slot back in.
It's hard to see from the photos but possibly could be persuaded back on and then torque up the bolts correctly and all good?
@ImranKabir started
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I might be being dim here, but what is the damage supposed to be?