There are a few things you need to know before you start putting shunt wire to slot car motors. First, make sure that the motor is in good condition and that there are no obstructions in the way of the wires. Second, make sure that the slots on the motor are wide enough for the wires to fit. Third, use a heat gun or an oven to heat up the wire until it is melted and then fit it into the slots. Fourth, use pliers or a vice to hold onto the wire and twist it until it is tight. Fifth, put a sealant on top of the wire and screw it into place. Finally, screw down the screws until they are tight.
