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39-138 Single Arm Crank Operator, 9-1/2"

What is the spline size of the item 39-139 casement operator? I am looking for this type and find 5/16 splines but can't find a matching set of an operator and folding handle. The folding handle #39-205 at 11/32 doesn't work with 5/16 operator, as it strips out. Thanks Steve