window crank

A home owner from Missoula Mt says:
I'm looking for the window handle(crank) to fit this model operator. The only marking I can find is"617 Patent Pend"
I have attached pics of the operator, the lock and the splined mechanism that i'm trying to find a handle for...hope this helps. I talked on the phone to a man named Steve today.
Thanks,
Ken Patterson
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Bob from SWISCO responded:

Hey Ken. Look at our 39-175 and 39-176 Crank Operators. Look them over and see if they match what you need. You can use the 39-109B 3/8" Pella handle and 39-314 Cover with these operators.

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