one of my levers require me to pull it farther than the other.i've tried fixing it at the barrel adjuster, but it doesn't seem to make much difference.
I've done the same thing that Blind showed you how to do but instead of using the knarp that way you can take a drill and drill a hole in the side of your lever, so the cable goes threw the lever,threw the knarp,and out the hole,then you can pull on the cable nice and snug then tighten down the knarp,cut off remaining cable and it works like the bomb,another tip you can do is,you can illiminate the adjusting barrels and run your cable straight to the brake arm itself,and just use your adjustment from the levers,start by adjusting your barrels out almost all the way,pull your cable tight,tighten knarp,at this point you won't be able to pull levers at all,then adjust your barrels down towards lever equally and you should be happening.when drilling your hole just use a bit a hair bigger than the inner cable itself. Armstrong
I had a similar set up a while back, but didn't use a knarp, just used two equal length outer and inner cables, and joined the two inners up between the brake arms using a regular cable clamp that I drilled out a little so they'd fit through... same theory as the knarp technique only you clamp the cable between the arms and not at the brake lever.