The way to do this is to solder one end of the resistor to the same lug on the switch where the single-coil hot wire connects. The other end of the resistor gets soldered to ground."
Ok so I have tried it today but it doesn't seem to work as intended.
Problem is, when I connect a resistor as described (I used 1/4W, 5% tolerance, 470K, one end to hot on switch, one end to ground ) it mutes the pickup completely as soon as the resistor touches ground.
I am confused now.