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I had a few emails with the guy who did that video in trying to sort out the bar end junction box. Glad I made the effort in the long run but it was an arse trying to get everything just as I wanted it (bought the Pro bars with the holes already in so no drilling/filing for me).
My R8070 shifters have two ports in them so one port in the left goes to the bar-end, one to the RHS and the 2nd port on the RHS is the one that goes into the frame.
atz
https://www.youtube.com/watch?v=cON3w1IL_7k
Looks like it has two ports. So you use the Y cable for the two shifters and plug that into the bar end Junc. Then try and work out how to run the RD cable to that junction as well? Seems like a silly idea but would require the fewest parts.