Quote:
The bridging resistor to bring down the effective value of the pot bridges across the center wiper and the hot lug in, NOT the ground.
But that won't bring down the effective value of the pot - not when it's full up, anyway. The resistor is then bypassed by the pot rotor being in contact with the top lug. It will certainly reduce the apparent value as the pot is turned down, but on a sliding scale and only becoming fully effective at zero.
To reduce the effective value of the pot as a load on the pickup, the resistor DOES need to be in parallel with the whole track, from the top lug to ground. This is what provides the load on the pickup.
Volume pots don't work just as a variable resistor, they work as a potential divider, and it's the ratio of resistances between ground, input and output that controls the overall volume - if it didn't work like this, the volume would never go to zero.
If you don't believe me, try lifting the ground lug on a volume pot and see what happens!