Alumium Awning Window Gear Box

A quick learner from Leesburg, FL says:
Windows will no longer close all the way by themselfs, you have to go outside and push them the rest of the way closed. Handle just spins when windows are still 4" open.
I assumed it would be the gear box, I need 2 of these and they measure from the outside of the tab that connects to the window arms to the outside of the opposite tab. (see photo's) The windows are considered 36" wide each.
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Bob from SWISCO responded:

Take a look at our 39-234 and 39-253. Carefully look these over and see if you think they match what you need.

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