13 Then he feeds the wire into manageable sections of shrink tube. We say manageable because trying to feed 10 or more feet of wire into shrink tube will be an exercise in aggravation. Lucky works in 2-foot sections at a time and what you are looking at here is the proper way to seam the pieces of shrink tube. After he has one piece fed over the wires, he heats about a 1-inch section. This steps it down and allows the next piece to slip over. Once he applies heat to the rest of the tube, this circuit branch will be ready to feed into the trunk.