Roto Straight Arm Operators
Roto made 2 styles and are designed for 2 different applications. X-Drive operators with a protruding Hex shaped spline that the crank handle fits over. Pro-Drive operators have a hex shaped hole in the base and the crank handle has a Hex shaped shaft the fits into operator. Applications: Wood Operators have a notch out in the base. Vinyl Windows have a flat base. The X-Drive & Pro-Drive operators are interchangeable, same design, different crank handle. To identify your Roto operator - Remove and check part number imprinted on the underside of the housing.