Hi,
I tried to follow your advice and soldered the 3 black wires(2 pickups and 1 bridge) to the master volume.
also added a copper shield that includes a wiring point from the tremolo in order to deal with the buzz issue.,
Now I figured out that the Lead circuit works fine with all the 3 pickups working, the selector switch also functions well .
But the problem is that the Rhythm circuit won't work, there is a buzz noise from the amp when I change it to the rhythm circuit, it won't let me reduce the volume with the Rhythm volume switch
it would be great to hear if you have any suggestions,
there is a pic:
Thanks,