OK, two pics. One of how my canti's used to be routed (this was as the frame came when I bought it new in '96), with the small plastic tube that went from the cable stop under the frame and round the one of the seat tube. Other is of how I run my V's now. If you find the ferrule moving through the cable stop under the top tube then chuck in one of those adapters I posted earlier and run the cable in to that. 
