Ugh. I feel dumb. So I need to ask some questions that will probably seem ridiculous to you:
1. When you say "Use all four conductors, wiring two to the hots, and two separate conductors for the grounds", I assume you mean that I use them as follows:
Conductor A: Connects Left hot on the RCA input to the Left input on the volume pot
Conductor B: Connects Right hot on the RCA input to the right input on the volume pot
Conductor C: Connects Left ground on the RCA input to the ground input on the volume pot
Conductor D: Connects Right ground on the RCA input to the ground input on the volume pot (i.e., connected to the same place on the volume pot as Connector C - alternatively, on the volume pot side, twist Conductors C and D together before soldering to the volume pot)
Is that right?
2. When you say "Ground the shield at the cable's load (volume pot).", I assume you mean that I should ground the shield to the solder lug that you mention at the end of your post, right? I.e., I drill a hole close to the volume pot, install a solder lug, and ground the shield to the chassis plate, not to the ground lug on the volume pot, correct?
3. The solder lug mentioned below doesn't need to be attached to anything (other than the chassis plate and the cable shield), right?
Sorry for making such a simple question complicated...
Adam