Sorry John, I did some searching and I could not find ir either (it was some years ago), I will try to explain how this counterweight worked:
a) It was made from a different metal than the original one
b) It was not "centered", it was off-cenetered in order to have more weight at the bottom of the tonearm
c) It had a small screww to attach it to the arm tube, instalation was really easy.
As for the incognito kit, not sure if it had a Litz wiring, silver maybe?
here is what I found at the Incognito web page:
Incognito Rega Arm Rewire
Now also available with silver loom
A one piece, cartridge clip to phono sockets tonearm cable, specifically designed for all forms of Rega based tonearms.
The Incognito cable features a continuous cable run from cartridge tags to phono plug.
The heart of the assembly is a gold plated aluminium slug, situated at the base of the arm pillar, to which all earths are connected, grounding the various components of the arm assembly without the use of additional ground wires.
The external section of the cable is run through a Faraday cage assembly inside which, protected by a spiral polythene tube, run the left and right channel signal leads. The signal leads are therefore shielded, but held at a fixed distance from the screen.