Window crank

A quick learner from Kingsport Tn says:
We need to replace this crank the rods are 16 1/2" long
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Emily from SWISCO responded:

Could you show us the arms that move the window sash? We would also need to see your operator flipped around to show us the base. Thank you! 

A quick learner from Kingsport Tn says:
There is also the number 121
Stamped on the back.
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Tom from SWISCO responded:

Hey there, maybe I can help. You have a very old Andersen brand operator. These haven't been made in a long time and there is no direct substitute to my knowledge. The only thing we have that may work is our 39-389 , though it may require some adaptation of the sill to work. Look it over and let me know what you think.

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