A quick learner from Massachusetts says:
I have a broken piece to this handle and it would not crank my window.
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Bob from SWISCO responded:

This handle might be our 39-226, which has a 5/16" male hex. Compare and see what you think. Note however if the worm gear in the operator popped out with this handle, the entire mechanism has broken down and must be replaced. Let me know if you have further questions. 

39-226 : Male Roto Folding Handle
Male Roto Folding Handle
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