"To perform this, have the headstock facing away from you. Remove
the pickguard and flip it over:
1. Disconnect the middle pickup lead from the top right post
on the selector switch. Also, remove the mid pickup ground
(braided wire) from the bass tone control, or whichever pot
it is soldered to.
2. Find the red wire running from the left post of the 5th knob
to the center post of the bass volume pot and remove this
wire completely. Keep the wire as you'll need it later.
3. Find the red wire running from the bottom right post of the
selector switch to the middle post on the 5th volume pot.
Remove wire at middle post of 5th knob, and solder it to
middle post of bass volume pot.
4. Solder the mid pickup lead to the center tap on the 5th pot.
5. Solder the mid pickup ground (braided wire) to the left tap
on the 5th pot, as well as to the pot itself. You may have
to strip the wire to have enough braid for this. I ran the
braid through the tap, soldered it at the tap and then to
the pot.
6. Utilizing the wire removed in step 2, run it from the right
tap of the 5th pot to the left tap of the bass volume pot.
Tracing this wire, you'll see that it is the hot supply from
the input jack, which is jumped through the treble volume pot
as well."
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