Replacement crank mechanism needed

A quick learner from Miami, FL says:
The body shows markings 45411 and the arm shows 31876. The teeth on the arm gear have broken off.
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Tom from SWISCO responded:

Hello! Please see our 39-221B operator, 39-451 cover and handle, and finally the 39-545 stud bracket. I think these parts match up to what you have now, but look them over and let me know what you think.

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