Route it the other direction. Start where the housing exits the bar.
Chris
What the poster above me said. Push the cable housing in the exit first and it should exit the end of the bar. Or you can put a cable through the exit, thread the housing onto that cable, and then guide it through from the end of the bar that way.
Ok… much easier than the above suggestions…
Take an old piece of cable inner… bend it back on itself so you have an elongated loop…
feed the loop into the bar end vertically…and when you pass the cable in from the hole on the bottom of the base bar, you can ‘catch’ the cable end.
Put just a bit of tension on the loop, pulling very gently towards you, as you feed the outer into the base bar (twisting slightly may help) and the outer
will come around the corner easily. This is how I did mine… worked perfectly, took 20 seconds…
Feeding the housing from the exit point out toward the brake levers without any inner cable inside works fine. It takes no time at all and goes around the bend easily.