Can you not just plug the sprint buttons directly into the second/third port of the shifters? Give it a test but pretty sure you can do that especially with dura ace levers.
@onyerbike
Don't need to drill carbon bars that already have internal wiring so long as the middle (stem) and drop corners aren't re-enforced (blocked up)....
on first attempt it may seem that they are blocked but I bent the end of an outer brake cable up slightly and did a lot of frustrated stabbing in order to path it through, I replaced this with string, made all the needed paths up that way and then pulled through the Y cable as needed.
Pretty happy with final result
They're not sprint buttons, they're TT shifter pods and I don't (yet) have DA levers so I'm not sure if my current ones have extra ports or not. Maybe.
Can you not just plug the sprint buttons directly into the second/third port of the shifters? Give it a test but pretty sure you can do that especially with dura ace levers.
@onyerbike
Don't need to drill carbon bars that already have internal wiring so long as the middle (stem) and drop corners aren't re-enforced (blocked up)....
on first attempt it may seem that they are blocked but I bent the end of an outer brake cable up slightly and did a lot of frustrated stabbing in order to path it through, I replaced this with string, made all the needed paths up that way and then pulled through the Y cable as needed.
Pretty happy with final result