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hippy
Problem is if there was an issue fitting a a di2 wire into the frame to the junction box B from the shifter, you’ll have the same issue no matter what junction box A you use, bar end or under the stem.
I’ve not built a new crux yet but I’d assume it’s like the old SL6 tarmacs and you need to fish the di2 wire into the hole the rear brake goes in, but needs to be fitted before the hose.
Then heatshrink it to the hose and into the bars, it looks so damn clean when done well