I bought a house with about 16 window openers

A contractor from Mulvane, Kansas says:
The house I bought was built in 1960. About 1/2 of the window opneners do not work. Some just missing handles other's if you crank, they just spin. The beveled gears are stripped. The arms are over 12 inches and clip into a rail on the bottom of the window. These windows open out like an awning.

There are NO markings on the one I removed and took pictures of. The crank has a 6 sided end to it's shaft. The shaft has a C-clip to hold it in place but is east to pull out of the housing. There are some sort of carbon bushing the swing arms pivot on and some are crumbling. If there were ever greased (white Lithium?) they are all dried up.

If you can supply replacement parts contact me..
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Tom from SWISCO responded:

I recognize this operator. It is very old and it hasn't been made for a long time. We don't have a confirmed replacement, but we think our 39-389 or 39-390 are the best options we carry (depending on size). Look them over and let me know what you think. I cannot guarantee if either can work, and even if they can, it may still require some adaptation of the sill to accommodate the new design. A new 39-286 handle may also be necessary.

I'm sorry we can't recommend a closer match!

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