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Yokomo 17mm Aluminum Clamping Servo Horn (23T-Airtonics/Sanwa/KO), YOKZC-204317 115118 This is the Direct PoweredAluminum Clamping Servo Horn is an aluminum servo horn that allows more direct operation of the servo. The distance from the servo output shaft to the center of the pillow ball attachment hole at the tip is 17mm, and matches the servo shaft spline (23T) made by Sanwa or KO. It is the best size for touring cars.