casement window cranks stripped

A home owner from Colorado Springs says:
May 7, 2019
Most of the parts that are problematic are the cranks. Is there a way to replace this unit without replacing the entire unit with the arm? I did watch the video about how to replace the entire unit. 3 are the type in 550. Another stripped crank goes to a standard right opening arm like 551. The rest are stripped as in 546.
Thumbnail of the uploaded file named 546.jpg
Thumbnail of the uploaded file named 550.jpg
Thumbnail of the uploaded file named 551.jpg
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Dave Sr. from SWISCO responded:
May 9, 2019

Hello. It's a little difficult to say which replacement operator will work without knowing the measurements of what you have. To start, you may want to take a closer look into the 39-083. You want to consider the "elbow to elbow" measurement when looking over our part. Get back to us and let us know if this part can be used as an alternative. 
Dual Arm Crank, 21-1/2"
Dual Arm Crank, 21-1/2"
39-083
$55.87
Dual Arm Crank, 16"
Dual Arm Crank, 16"
39-140
$53.95
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