Couple of ways to do it tankster. If you can find the correct size wire for the smaller size with a plastic insulator on it just strip the wire for the thin part and leave the insulator for the thicker part.
My favorite way is to use thin solder for the thicker part. I roll it under a file to give it a little texture. The stuff from Radio hack is rosin core so the center is more or less marked and it and be drilled out to accept the thinner wire.
Here's the LG on a Tony I did a while back. The thin wire runs up the back of the strut.