Crank mechanism for casement window is malfunctioning

A home owner from Jersey City, NJ says:
September 28, 2022
The crank mechanism of one of my casement windows doesn't work properly anymore. When turning the crank, it feels as if the gear is missing some of its teeth. It grabs sometimes, but often it doesn't. I pulled the crank itself off the shaft and confirmed that the issue is *not* simply a loose fit of the crank on the shaft.

It appears easy enough to remove the entire crank assembly and replace it. Can you point me to the correct replacement part(s)? Thank you! :)
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Tom from SWISCO responded:
October 3, 2022

Certainly! Your operator looks like an older version of our 39-027E and 39-028E. I think these may be just what you need, but please review our dimensions to see how well they compare. We have other options if this is no good, so just let me know and I'd be happy to find something else for you.

Dimensions for 39-027e
Dimensions for 39-027e
Ellipse Style Single Arm Operator, 9-1/2"
Ellipse Style Single Arm Operator, 9-1/2"
39-027E
$20.70
Ellipse Style Single Arm Operator, 9-1/2"
Ellipse Style Single Arm Operator, 9-1/2"
39-028E
$20.70
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