Looking for replacement crank for casement window.

A home owner from Herndon, VA says:
Handle on the small casement window just spins so need to replace entire crank system. Cannot identify part needed as there are no markings. Windows are Barber and Ross, a company that is now out of business so cannot determine what crank supplier they used. Thanks.
User submitted photos of an awning window operator.
Profile picture of Tom
Tom from SWISCO responded:
This looks a lot like our 39-083. Check it out and see what you think. You may also want to see our 39-140, which is a bit smaller. It's hard to make out the size of your operator, but check these two parts out and see what you think.
A home owner from Herndon, VA says:
Thanks, I think the smaller one will work. Appreciate the recommendation.
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