If the lamp (particularly floor lamps) still has the old cord, cut off the plug on the old cord and splice/tape the new cord to the old cord together. (Don’t put so much tape that it won’t fit through the existing hole.) Then pull the cord all the way through the lamp until the new cord is at the top & remove the old cord—easiest way I know to do it. And I learned the hard way. Also, if you can’t understand why you can’t get a new cord into just a tabletop lamp, most new cords are wider so just look for the SPT-1 for a standard lamp. I struggled with this when I was trying to teach myself in the beginning and I thought I was just doing it wrong. Here is a better”technical” definition I found….it mentions the thickness of the wires. 18/2, SPT-1 wire has an insulation thickness of .030″ and 18/2, SPT-2 has insulation that is .045″ thick. Because of the thicker insulation, SPT-2 wire has a higher maximum amp rating than SPT-1, which means it can power more lights and decorations. 18/2, SPT-1 is rated at 7...