Cut new heat shrink tube sleeve with scissors so it's slightly longer than the open wires you will solder together. Slide ...

The large prong on a plug is the neutral terminal. Again using a heat gun, move the heat shrink tube over the connectors and ...

The next step is to shrink the size of the solder pads just a little bit. This is to compensate for the inevitable melting that will be caused by the heat from the laser. Without this step ...