Originally Posted by Retro Grouch
Trust me, I've done a bunch of these conversions and the #1 bug-a-boo is the rear cable stop. It's a common enough problem that Problem Solvers manufacturers $25.00 clamp-on cable stops in four tubeing sizes.
Or, how about this:
http://www.nashbar.com/profile.cfm?c...%20Accessories
For $1 it makes a cable stop next to your seatpost bolt. Seems like a great idea and a lot cheaper than $25

Cable position might not be ideal for v-brakes, but it seems worth a try!