Tom from SWISCO responded:
April 14, 2015
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?
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