Anderson replacement hardware

A quick learner from Rochester NY says:
Can you tell us which part we need. The window cranks but syops before it is closed and won't turn anymore.
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Jasmine from SWISCO responded:

Thanks for reaching out! Your Andersen awning window operator looks like it could be either our 39-389 or 39-390. To determine which of these is the right fit for your window, carefully compare the dimensions below. You'll especially want to confirm the length of the arm.

The compatible crank handle for both of these operators is part 39-286.

Dimensions for 39-389
Dimensions for 39-389

Dimensions for 39-390
Dimensions for 39-390

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