A counterpoise device for cantilevering at least one cylinder of a printing press has a movable counterpoise element for selectively contacting the cylinder and a stationary mount. Peripheral seats in the form of grooves, are provided in register in peripheral slide surfaces of respectively the cover portion and the body forming the spigot-socket combination. The seat back is rotatable relative to the frame between a back support position and a travel seat support position where the seat back is substantially parallel to and above the seat base when the stroller is in an operating position. The cooling tubule is connected to a cooling tubing of the cooling system and a fluid driven by a pump circulates in the cooling tubing and the cooling tubule for heat dissipation. The controller provides the control signal based on the relative values of the reference voltage and the measurement voltage.