Originally Posted by
Wordbiker
Yes: Don't.
I know it looks "clean", but it does make servicing the bike more difficult and generally reduces the efficiency of the cables.
Your response makes no sense. I've had a bike with an internally routed rear brake cable for 10 years now. You poke the housing through and it pops out the other end. No vacuum cleaner or thread required. No corrosion on cable stops or ferrules and no bare cable to sweat on along the top tube. Overall, a big improvement over the standard 7 o'clock external stop method.