Window Crank ID

A quick learner from VA says:
The crank on my window does not work. The gears appear to no be working and not sure the part I need. The arms work fine. The window opens left to outside.
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Bob from SWISCO responded:

Thanks for posting. I cannot be entirely sure what replacement operator would be best for you without seeing it entirely removed from the window, with both arms in full view. However, I suggest you take a look at either our 39-031 and 39-032 Entrygard Dual Arm Operator, or our 39-155 and 39-156 Caradco Window Crank Operator. Note the different lengths of the link arm. Compare all the dimensions of either set with your old operator and see what you think would work best for you. 

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