Crank mechanism not working

A home owner from Ashland, Oregon says:
Hello. We have 4 of these small windows. The crank mechanism has failed on each. Can you help? Thank you! Mike.
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Tom from SWISCO responded:

Hello! Your operator looks like a match for our 39-239B . We also sell the 39-451 cover and handle separately. Look these parts over and please tell me if you had any questions.

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