Extension for Pan Am crank

A professional from USA says:
I recently installed shutters with pam am crank style windows - I need to find an extension crank so my customer can operate her windows
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Dave Sr. from SWISCO responded:
Thank you for posting. Check out our 39-157 and 39-337 and see if these could possibly work for you. The spline for these extenders is 11/32". What is the spline for your handle?
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