Jeld-Wen W-2500 casement windows

A handy person from Detroit says:
...we would like to add marble sills to our new windows, but this would require a crank handle extension of about 1"...does this exist...? Thank You. Tim.
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Paul from SWISCO responded:
Sure, we carry a wide variety of crank operator extensions. The question is what kind would work for you. Jeld-Wend has been known to use Truth hardware, which very reliably have 11/32" splines. If your cranks also have 11/32" diameter splines, see our 39-337 extension. We also have the 39-157.
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