Looking for caradco operator, the gear retaining screw is stripped, o it can not be closed fully

A home owner from Tucson says:
May 2, 2018
The arms measure 21.5

This looks like a 39-083
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Tom from SWISCO responded:
May 7, 2018

Hi there, thanks for the post and the photo! You are certainly correct that our 39-083 21-1/2" arm crank will work on your Caradco window. Check out the video below if you need any installation guidance.
Dual Arm Crank, 21-1/2"
Dual Arm Crank, 21-1/2"
39-083
$55.87
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