Window operator

A contractor from Burlington says:
One of the internal gears must be missing or have a broken tooth. Because it works most of the time but right at the end, where it pulls the window in for a tight seal, it doesnt grip.
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Take a look at our 39-239. I believe this is a match. You could likely re-use your black shoes.
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