I used a part from an old V brake I got from the parts bin in my local bike shop, 2 spoke nipples and the threaded part of a spoke and I had to drill a 4mm hole through the brake arm. Havent tested it out yet but feels pretty good and hides the cable out of the wind behind the seat tube!

M@TTY

I have been thinking about a travel agent but thought I would see how it works first!
also think this set up might be a little bit more difficult to achieve on an oval or tektro brake as the arms are closer together!

M@TTY