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Plastic sleeve, then di2 Park tool cable thing inside, done.
If the plastic sleeve is not doing it then brake cable first to guide the sleeve or resort to magnet.
Whatever you do you need to plan beforehand how to route all the bullshit in the easiest way possible. Guide several cables in one if possible, get the Di2 before the hydro hoses, etc.
I do this all the time unfortunately, feel free to ask if it gets horrible.
Netakure-
Hydro and the di2 into the frame can go at the end as the default routing seems to be via the stem. I ran some cotton through for both the di2 cables without much drama but I'll be damned if I can get a brake cable through there once I tie it to the cotton, even with a pull on the end of the thread it comes out the stem.
Any tips before I lose my shit?
Edit - the challenge, I think, is around the bolts for the garmin mount as I think it's quite a narrow gap
atz
I've done a couple of frames before, but the angles on the integrated bars is giving me the shits. I'll start with thread and see where I end up.