skylight window crank extension

A home owner from USa says:
I need an extension for a skylight window crank.
I notice you have 2" crank handle extension 11/32" #39-337. The female opening on my crank handle measures 3/8". Will this extension work for me?
I tried a 5/16" extension and it was way to small.

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Tom from SWISCO responded:
It might work, but you should triple check your own measurements. We don't have anything in 3/8". It's possible that yours is actually 11/32", since that's not too far off, but I cannot guarantee it. You will have to measure the spline as precisely as possible in order to confirm.
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