Operator not working

A quick learner from Spokane, WA says:
The operator crank will open the window but slips out when trying to close the window. Instead of turning the gears, it rotates off the operator completely.
Thumbnail of the uploaded file named IMG_5165.jpeg
Thumbnail of the uploaded file named IMG_5166.jpeg
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Emily from SWISCO responded:

Hello there!

It appears the worm gear is stripped which means you'll need a new operator. We can help with that but we'll need more information. Can you open the window and show us a full view of the operator's arms? 

A quick learner from Spokane, WA says:
Is this picture enough?
Thumbnail of the uploaded file named IMG_5078.jpeg
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Emily from SWISCO responded:

Yes, thank you! Take a look at the operators we've listed on this page. The best match will ultimately depend on the length of the link arm. Review the specifications and see if one matches up to your old assembly. 

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