Slipping gear

A quick learner from Lenexa, Kansas says:
Hurd windows crank works until you get here, then it just doesn't tighten. Looking in from the outside the gears slip vertically hence no tightening.
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Bob from SWISCO responded:

See our 39-239C Awning Operator, along with the 39-436 Pivot Slides. See if this hardware matches up. For the cover and handle, see the 39-375 or 39-451 , depending on which style you prefer.

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