Window crank won't crank back gear slips

A handy person from New Hampshire says:
September 14, 2019
Looking for replacement. The hardware on the window says Del Mar Canada. The crank arm has 21550 on it.
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Dave Sr. from SWISCO responded:
September 18, 2019

Thank you for reaching out to SWISCO. Take a look and check to see if our 39-317 split-arm operator is compatible with your part. Carefully review our measurements and let us know if we have found your match.
Truth Split-Arm Operator
Truth Split-Arm Operator
39-317
$35.70
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