I have the older version with the long slender Singer lamp. There's two rings on the end where the wire comes out. They need to come off, poking gently with a screw driver or if you have a swiss knife with a can opener like in the video. The end of the wires is soldered on to the copper plate connection parts, when it comes appart you see how it works. The slender Singer lamp is less prone to problems with the light switch.