need to replace left dual arm casement window operator

A quick learner from 90266 says:
Hi -- I need to replace the dual arm casement window operator shown above. In looking on your site, I'm thinking I need part 39-341 plus the hand crank 39-205. Can you please let me know if I got that right? Thanks very much.
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Thumbnail of the uploaded file named casement window op.jpg
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Bob from SWISCO responded:

A good guess, as that operator is very, very similar. However, I believe you actually need either the 39-253LB or 39-438B. The difference between these two operators is explained in the video below. In either case, you can use the 39-375 or 39-451 as a new cover & handle, depending on which style you prefer.

A quick learner from 90266 says:
thanks very much -- I really appreciate your help!
Comparing the 39-253LB & 39-438B Operators
Comparing the 39-253LB & 39-438B Operators
VIDEO
WATCH >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
How to Orient a Dual-Arm Operator
How to Orient a Dual-Arm Operator
VIDEO
WATCH >
How to identify casement and awning operators
How to identify casement and awning operators
GUIDE
READ >
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