1940s screen door with jalousie window - operator is skipping

A home owner from Baltimore, MD says:
I'm trying to track down a new mechanism for operating this jalousie window. And I cannot find a brand name or model number anywhere om the door to help with the search. The operator arm skips, and I can no longer fully close the window, and to open it, I need to help it along. Do you have any suggestions? Many thanks!
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Dave Sr. from SWISCO responded:

Hi there! Take a look at the rack operators, the 39-050 and the 39-256 kit. See which one matches up best to your operator. These could be the type you are looking for.

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