The present invention provides a method for continuously producing pieces of liquid-filled gum material, including applying an anti-sticking agent to the rope of liquid-filled gum material before it is individually cut into pieces. If the USB could normally operate until the output current reaches a threshold value, a higher level is set for the output current, otherwise a lower level is set instead. The switch resource includes a classifier. The pumps and the control valves can be operated in unison to supply equal amounts of hydraulic fluid to the sets of jacks so that all of the jacks may be raised or lowered in unison. According to a further embodiment of the invention, improved multipass SHG is provided by the use of an inverting self-imaging telescope in combination with a wedged phasor.