Regulator Gears are Worn

A handy person from Bismarck, ND says:
October 25, 2021
I'm helping a friend get his house ready to sell. His front window, will open fine, but you need to pull on the window and crank the handle to turn. Looks like the gears on the regulator are very worn. I believe the it is a Minnkota window. It is a large picture window in the front of his house with 2 (left and right) side opening panels. I believe the windows are from around 1989 or 1990 time frame. I have attached pictures of the mechanism of the left window (from the inside looking out). Please let me know if you need additional pictures or measurements. Thank you.
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Emily from SWISCO responded:
October 28, 2021

Hello!

This looks like either our 39-253LB & 39-253RB or the 39-438B & 39-439B. The difference between these two sets of operators is the appendage at the end of the straight arm. The video below will help you choose the correct replacement. 
Encore Dual Arm Operator, Sill Mount, Low Profile
Encore Dual Arm Operator, Sill Mount, Low Profile
39-439B
$38.64
Encore Dual Arm Operator, Sill Mount, Low Profile
Encore Dual Arm Operator, Sill Mount, Low Profile
39-438B
$38.64
Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253LB
$30.70
Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253RB
$30.70
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
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