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Actuator Positioner Satellite Dish Antenna 18" Jack Venture C-Band Arm with Limit Reed Sensor Automatic Waterproof Mover.Mechanical actuators typically convert rotary motion of a control knob or handle into linear displacement via screws and/or gears to which the knob or handle is attached. A jackscrew or car jack is a familiar mechanical actuator. Another family of actuators are based on the segmented spindle. Rotation of the jack handle is converted mechanically into the linear motion of the jack head.