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.
Profile picture of Paul
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.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.