crank arm casement

A quick learner from Oregon says:
I am looking for these
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Emily from SWISCO responded:

Hello!

This reminds me of our 39-399 and 39-400 Roto operators which use the 39-541 track slider (sold separately). Compare the dimensions to see if this matches what you're looking for. 

Anatomy of a casement window
Anatomy of a casement window
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