Truth window crank for casement window

A handy person from San Francisco says:
The crank stopped working on the right hand window. I'm attaching a photo of the broken crank. Also attaching a photo of the working crank on the left-hand window, which I'm assuming is a mirror image of the one on the right hand side. I think we'd like to replace the workings in the crank on the right hand side.
Thumbnail of the uploaded file named Operator Base
Thumbnail of the uploaded file named Arms
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Lauren from SWISCO responded:

Hello, thank you for posting,

Please start by reviewing the style and dimensions of the 39-031 and 39-032 or the 39-155 and 39-156 operators. The main difference is the length of the short link arm. Compare to your original to confirm a good fit! Also see the compatible 39-107 cover and 39-114L handle if needed.

Let us know what you think and if you have any additional questions. 

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