Millgard Styline Operator Handle Extension

A landlord from Seattle says:
I have a Millgard Styline Casement window with a Fold down Roto handle, I need an extension for the slpine or a longer shaft handle to clear the sill. not sure of the spline size?
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Tom from SWISCO responded:
I'm not sure what spline size you need, either. There are many possibilities. Could you measure it to confirm?
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