Window crank needs to be repaired/replaced

A quick learner from Seattle says:
HI - My son broke the window crank on his bedroom window. The window does open & close, but the crank is bust. Please let me know what new parts I need to buy & if there are any instructions to install. Thanks
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Tom from SWISCO responded:

Hello! It looks like the gears stripped out. This usually happens when the handle is turned too tightly when opening or closing the window over a long course of time.

You'll need a new operator. I think our 39-031 and 39-032 are close, but you should look over our dimensions to ensure they match up. We also have a video that you may find helpful, which I'll post below.

You should be able to reuse your old handle and cover without issue.

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