Black = inside slug coil
White = inside screw coil
Green = outside screw coil
Red = outside slug coil
Shield = ground
Depending on which coil you want to tap, one wire goes to the "out of phase" post on the switch, and all the others go to the ground.
I was wrong about moving just one wire. Reverse that. All wires but one will need to be moved. For this mod, it's usually recommended you use a push/pull to go from normal to tapped. You don't want that, so you'll need to do some extensive rewiring. Unless someone else can answer this...you'll need to give me a few days to sort it out.