sort-of cheap shielding

I used to shield small diameter cables by cutting away the plastic
insulation from RG-8 coaxial cable, used pieces, removed from
service...maybe try a 'CB repair store' locally or at a truck stop. I
guess you don't want it TOO old, waterlogged etc. If the copper has
turned black, keep looking. YOu can usually find fresh solderable clean
copper under the insulation on a healthier piece.

I think you usually only ground one end for ground-loop issues, but I
can remember whether it's at the source or load end...this may have
already been discussed here or on Mariss' Gecko site.

Again, for ground loop reasons, it would be a good idea (or maybe
mandatory) to keep multiple home-made shielded cables like this from
electrically making contact with each other.

For signal cables, you can just snake the unshielded cable thru the
braid. Power cables could be made from pairs of stranded #14...I always
seem to find the oil-resistant stuff with the second layer on the
outside at hardware stores (?TTN).

Murray