Crank gear slipping

A quick learner from Cambridge ont Canada says:
We have at least 4 windows that we can open or close with the crank. They are approx 3' tall by 15" wide. Please see pictures. Thanks

User submitted image of their window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. If possible, please remove your operator from the window and show us a picture of the whole thing by itself. That will help us find a good match for it.
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