Window crank operator

A quick learner from Minnesota says:
Looking for a replacement for window crank operator, Anderson window, installed 1999. On part has nubmer F 9400 8a
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Bob from SWISCO responded:

See our 39-332 Straight Arm Andersen Operator. Look it over and see if you think this matches what you need. 

Anatomy of a casement window
Anatomy of a casement window
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