Individual Pickup Selection
With a Single Master Tone Control

Versatile Pickup Selection/Phasing with Single Master Tone
All capacitors metal film.
All switches DPDT (on-off-on).
Sw1 - Neck Select, Sw2 - Middle Select, Sw3 - Bridge Select
R1 - Volume
C1/R2 Master Tone, * marks low terminal of audio pot
C1 = 0.01uf when R2 = 250k, C1 = 0.02uf when R2 = 500k You may substitute other values for C1 to suit your tastes.

This is the version of the modification to use if your Strat only has one tone control -- or if you've already used one of them for something else.