A couple of notches on the shaft, with a circlip fitted could help. Or with a jeweeeeeeller's hand drill, you could make a small hole through the top of the shaft, and lock it in with a paper clip. Just a thought.
@rodabod started
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A couple of notches on the shaft, with a circlip fitted could help. Or with a jeweeeeeeller's hand drill, you could make a small hole through the top of the shaft, and lock it in with a paper clip. Just a thought.