Crank for windows

A quick learner from Malone New York says:
Missing piece that goes in handle and turns the gears
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Bob from SWISCO responded:

This looks like an Andersen operator; specifically, the handle is likely our 39-286. However, if the worm gear that the handle attaches to has popped off, I am afraid it means the entire operator has broken down and should be replaced. Fortunately I am fairly confident we can still help replacing the whole mechanism. I just need to see the entire assembly, including the link arm(s), to narrow this down. Many thanks. 

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