Replacement of window cranks.

A home owner from Monterey, CA says:
Window crank mechanism for older windows. The gears are starting to strip on these. One is completely gone and must be replaced and I would like to buys some extra ones to have on hand for the future. I could not find any names or markings on the existing ones.

Can you please help me?
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Tom from SWISCO responded:

Hello! I think we can help, yes. See our 39-021 and 39-020 operators. I think these may be just what you need but check them out and let me know if you had any questions!

Anatomy of a casement window
Anatomy of a casement window
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How to install a wood casement window crank
How to install a wood casement window crank
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