Truth casement window crank and arm hardware needed to replace

A quick learner from Grand forks ND says:

Our window cranks have been stripped over years of use. I had a window guy look at these and he figured they were from around 1991. I'm looking to make them work again. Can you help? Thanks in advance. Darren.

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Tom from SWISCO responded:

Hello, Darren. We have a few different operators that may match this. Start by looking at our 39-139 and 39-142. Note the difference in arm length, as well as the flat metal disc at the end of their arms. I can't see the end of your arm so I'm not certain if you have the same metal disc. That would be worth checking

39-139 : Single Arm Crank Operator, 9-1/2
Single Arm Crank Operator, 9-1/2"
39-142 : Single Arm Crank Operator, 11
Single Arm Crank Operator, 11"
Anatomy of a casement window
Anatomy of a casement window
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