Crank handle for window

A home owner from NJ says:
What part should I order to replace this handle. The opening is 5/16. No splines smooth interior on the hole
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Emily from SWISCO responded:

Hi there! It looks like you might have a Roto operator. Check out our 39-230 or 39-224. If you'd like us to confirm, you can show us your operator with the window open and with the arms fully visible. 

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