Stripped gears

A quick learner from Washington DC says:
Hello! Not sure the make of this window, hence the search! Hopefully the picture is enough. Need a new gear to open and close the window since the current one doesn't grip enough to close.

Thanks!!
Dan
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Bob from SWISCO responded:

This appears to be either a 39-253LB & 39-253RB , or the 39-439B & 39-438B . The only difference between these two sets of operators is the attachment at the end of the straight arm. The video below explains more.

How to Orient a Dual-Arm Operator
How to Orient a Dual-Arm Operator
VIDEO
WATCH >
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 >
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