Casement window handle and cover

A home owner from Sacramento, CA says:
Minimal markings, unfortunately. 3/8" spline
User submitted photo of their window operator.
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Tom from SWISCO responded:
We do carry the 39-375 folding handle with cover, which works on the same idea as yours, but its spline is 11/32", not the 3/8" you need. Can you confirm your measurement? We also have the 39-403 and 39-404, which have 3/8" splines, but they are specifically meant for Pella windows. What brand of window do you have?
A home owner says:
Hi, thanks for you reply. It is 3/8" spline. I hadn't measured correctly and ordered 11/32" which doesn't fit. I don't know the window brand as they were installed before we purchased the house.
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Tom from SWISCO responded:
Could the 39-403 and 39-404 work for you?
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