Need Replacement Window Crank

A home owner from Seattle says:
The round part the crank fits into (photo uploaded) has number 308003 A etched on it. The diameter of the opening is 6/16" and I believe is has 12 grooves on the screw like attachment to the base. Thank you for your help. Part is white.
Thumbnail of the uploaded file named window 1.jpg
Thumbnail of the uploaded file named window 2.jpg
Thumbnail of the uploaded file named window 3.jpg
Thumbnail of the uploaded file named Round part.jpg
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Tom from SWISCO responded:

Please see our 39-375 and 39-375 casement operator cranks. I think these may be what you're looking for.

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