I forgot to mention that we rewire all our machines, as a safety matter. It costs little, unless you need gromets and strain relief. If you do a lot of machines, you can get a roll of the correct gauge wire for your machine. Some applications require a soldering iron for the connectors on some controllers. Never use acid core solder, only rosin core for electrical applications. Practice is everything. Instruction is really needed to get a good end result. Some applications use, flux, a chemical, to make a prettier result. I'm sure U tube has something on it.