Windo crank mechanism: Marvin 30 years old

A quick learner from Marion, Massachusetts says:
June 14, 2021
The crank opens the window, but will not close the window. The worm gear just unscrews itself.
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Casey from SWISCO responded:
June 17, 2021

Hello,

The broken worm gear indicates that you will need to replace the whole assembly. If you could open the window and show us the arms that move the sash in and out, that will help us confirm the correct replacement. Thank you!
A quick learner from Marion, Massachusetts says:
June 18, 2021
Photos are as close as I could manage without taking the sill apart.
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Casey from SWISCO responded:
June 18, 2021

Take a look and compare our 39-216 operator to your original assembly, along with the related items on our product page. Thank you!
Single Arm Window Crank
Single Arm Window Crank
39-216
$40.39
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