Andersen window crank extensions to avoid blinds

A quick learner from USA says:
We are adding shutters to Anderson casement windows and need an extension to allow the windows to open.
Will the #39-157 extension with 11/32 spline fit the Anderson hardware???
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Paul from SWISCO responded:
I'm afraid our 39-157 extension will not work on a Andersen operator. Our 39-422 will, but please note that since it isn't Andersen product, it won't be completely mesh to the operator. Andersen uses a unique spline length.
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