Originally Posted by
One Wheel
This is the first bike I built up, and I learned that afterwards. It's very much a case of "if it ain't broke don't fix it" right now. I have a couple thousand miles on it with the current cable routing.
I agree that the routing is incorrect, but that's not causing your sliding problem.
The real cause is housing pushing it upwards owing to cable tension. This was s common problem BITD when clamp-on levers were SOP. Many companies brazed a small stop below the clamp to act as a positive stop.
BTW I understand why you routed the cables the way you did. The older style FD that your clamp is intended for has a housing stop, lacking on yours. They stopped having that feature sometime in the eighties when under the BB routing became the norm.