Need new crank handle operator

A home owner from Wakefield, MA says:

I need to replace a stripped crank handle operator for a vinyl casement window. I can't seem to find the right operator anywhere. Please advise.

User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Personally, I think this looks like our 39-188. Check out its specs and see if you can use this as a replacement.
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