Broken crank on window

A home owner from Chesterfield, Missouri says:
The crank has broken on one of our casement? windows and we do not know what parts to order. The running track is 27" long and the arms open to 25". The handle crank screws only so far on the broken window so that we can fully open it but can not close it. It does say Truth on the arm.
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Emily from SWISCO responded:

Hi there!

Start by comparing your dimensions to our 39-348 awning operator and see if this matches up to your original assembly. 

Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
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How to identify casement and awning operators
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