crank extension to get past window shutters

A home owner from Homer Glen, Illinois says:
Hello, I had window shutters put in and I need an extention for my crank to come out past the shutters to turn. Looking at your 4" crank are they pretty standard for all casement window crankers??
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Tom from SWISCO responded:
No, it really depends on what operator you have. What is the size of the spline for your existing handle? Basically, that's the handle's hole.
A home owner from Homer Glen says:
Thank you for writing back but I honestly have no clue what that would be. I am going to guess here that I think I measured this right and say 11 mm in diameter??? Does that sound right?? They are Norco windows. Old Norco windows. Without all this conversation, I was just gonna order the 39-157 extension.
Thank you so much!!
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Tom from SWISCO responded:
I'm not sure what you measured, so I can't say. The 39-157 has and accepts an 11/32" spline. For example, it would work with our 39-114L, which also has an 11/32" spline. Check out the image below to see what you would measure for the 39-114L. What is this for your own handle, in inches?
Alternate view of the gear hole
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