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Regardless of how dangerous and unnecessary the lightbulb soldering idea is, if you have a two wire cord, the smooth insulated side of the cord would connect to the bottom tip of the lamp, and the ridged insulation side of the cord would solder to the screwshell part. If you have a three wire cord, connect the black wire to the bottom contact of the bulb, and the white wire to the screw shell part - and the ground wire (bare copper or green insulated) doesn't connect to anything at the lamp. The color coding, or the identification scheme on the insulation, only matters when you connect to a lamp socket. The idea was to keep the white wire connected to the screwshell - which has almost no voltage on it during normal installations - and the "hot" wire connects to the center tab down deep in the socket, where people wouldn't normally be likely to be sticking their fingers into it.
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