Window crank mechanism

A home owner from Michigan says:
I have a few windows that are 30 years old and mechanism doesn't work well. How would I know which one to buy. The number on the window is B25888Y26B-2 if that would help at all. Thanks Ron
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Emily from SWISCO responded:

Hi there!

We'd be happy to help but we'll need to see a photo of your operator with the window open so that the arms that move the sash are fully visible.

Thank you! 

39-097 : Pella Window Crank
Pella Window Crank
Anatomy of a casement window
Anatomy of a casement window
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