Justin,
The copper wire idea is highly experimental, and I have tried using it for the leaders, but it breaks very easily and also adds unwanted stiffness to the leader. I simply took a length or two of thin wire (from an electrical transformer) and laid is along the two legs before untwisting them. Then the copper wire twisted in nicely. But even though it did work, the leaders didn't last for long before the wire oxidized and as said: it was quite stiff too.
I think using a thin fluorocarbon mono for the leaders would be a better alternative to get something sinking... even though it of course sinks much more slowly than a copper wire.
Martin
