Adding shielding to existing cables

@erik_squires Why “no”?

from what I am able to understand, a shield is typically connected at one end (source end) via the rca metal body or chassis.  Doesn’t the rca plug ground connect to cassis ground?  If that is the case, how is running a ground wire from the shielding to chassis any different?

Lemming,

My "no" was to the extreme level of visually unappealing hackery here.

I mean, sure, add a shield and see where grounding it works best for you if that’s what you want to do.

From a "looks nice" and "doesn’t look like a mad scientists creation" point of view though, if you are going to start cutting off ends, why not just use some nice looking, shielded interconnect cables with new plugs? That may be all you need to stop the noise, and it will look nice and clean.

In other words, you are overthinking the solution already. Start with the normally suggested approach: Use foil shielded interconnects. You can make them yourself inexpensively.

THEN and only then if you still can't get relief start experimenting with novel grounding.

Oh, pro tip:

Building your own cables, use balanced cabled + a shield.

The inner conductors form the center and outer jacket connections.  The foil shield is connected only at the source jacket.

"Pro tip", good one. Tell 'em, pro, about your DIY cable skills. How about the "pro tip" where you discover your "pro cables" you built aren't even within 2dB of each other. 

DYODD OP. Read a few posts from this "pro" who is anything but. Draw your own conclusions.

Here is a great candidate.

https://www.parts-express.com/belden-brilliance-8451-22-awg-2c-mic-line-instrument-cable-beldfoil-sh...

The foil is a little better than braid at shielding.