Methods of dicing semiconductor wafers, each wafer having a plurality of integrated circuits, are described. Conventional packet network nodes react to congestion in packet network by dropping packets in a manner which is perceived by users to be indiscriminate. The apparatus further comprises stabilization means for stabilizing the orientation applied by the tumbling stretching rollers, applied to the helically cut film strip after it has been drawn from the mandrel. The power source is connected to the flash memory controller for supplying a working voltage. The six segments are jointed together to assemble a generally cylindrical structure on the rotary shaft. A guide portion is formed on the inner wall portion of the cap, closer to the front side than the barrel hold, to restrain over insertion of the rear end of the rear barrel into the cap.