Abstract: A jack shaft garage door operator is used for positively opening and closing a garage door and includes a jack shaft garage door operator drive having an electric motor. The electric motor is connected to a jack shaft garage door operator transmission. The transmission includes an opening flexible link storage unit or cable drum having an opening flexible link cable drive wrapped around it. Also connected to the jack shaft is a second cable drum having a closing flexible link or closing cable wound in the opposite direction from the opening cable. A compressional force transmitting member comprising a quick-turn bracket couples the closing cable to the garage door and is itself connected to an upper portion of the garage door to transmit a positive closing force to the garage door throughout its entire travel as the closing cable is drawn in and the opening cable is payed out under the operation of the electric motor.