Crank replacement

A home owner from Joplin, MO says:
I have 3 left and 3 right Windows that will crank out, but not back in. I'm assuming i need new operators. They look like Truth Entryguard Dyad, possibly. I think my handles are fine
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of the 39-216 and 39-217 casement operators to your hardware. Thanks for posting! 

Anatomy of a casement window
Anatomy of a casement window
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