Crank is difficult to close/open. Appears gears are broke

A landlord from Minnesota says:
Please recommend parts to repair. Fast learner, landlord
Thumbnail of the uploaded file named hinge base
Thumbnail of the uploaded file named installed operator
Thumbnail of the uploaded file named base hinge
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Emily from SWISCO responded:

Hi there!

The 39-138 resembles your old operator. The arm is 9-1/2" long when measured from the center of the gear to the center of the roller. You'll want to make sure your old assembly does too, as well as the same roller ours has. 

Dimensions for 39-138
Dimensions for 39-138

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