Originally Posted by Le Mechanic

I made a video about a year ago with some tips on internal routed cables. There's an example in the video of a certain cable stop Specialized uses that needs a ferrule with a teflon guide tail or a short teflon tube in the cable stop itself.It may just be on the aluminum Specialized models, but if you don't use them, the cables will cut through the cable stop over time. The Jagwire cable kits are decent.

https://www.youtube.com/watch?v=YTVQ0f9ydxg