So I converted one of my bikes to a townie sort of bike for my SO, flipped northroads, short tall stem, cushy spring seat, etc. I didn't want to leave her with center-pulls because they look tacky, and because I didn't want to fit a center-pull cable stop on the front so I made some MAFAC Racer's into a dual pivot sidepull and they work surprisingly well with weinmann upright bar Aluminum brake levers (circa 1969). The only modern piece is a 90* hard-line from a newer tektro V-brake for the front.
I ran a cable from the lever, into the 90* piece, then through the yoke wire quick-release, then attached it to the other quick-release yoke wire thingy. This only works because the MAFAC Racer's have an adjustable Yoke Wire.
Has anyone ever done this? I'm honestly surprised that the mechanical advantage isn't way off. I didn't have any other sidepulls laying around to use and I think I might like this setup more than most old sidepulls/upright bar lever combinations.