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I thought that was for the older Tour de France model, this is the twin cabled Simplex Juy 51, from 1951.
Anyway it wasn't as hard as I thought, probably after having so much exposure to the older type I new what to expect.
The second cable is attached to the main cable via a nut and bolt, just before the chainstay gear lug. It is threaded through the same outer gear cable (I had to use brake cable as the gear cable was to narrow for both cables) and is attached to the pulley spring.
As I change gear the second cable pulls the pulley spring tighter. Not sure it really makes a difference but It looks really cool in action.
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We had a discussion on setting up these coil spring jobbies a few pages back - that should save you a few minutes and many cuss-words ;-)