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For those with di2, what do you use to keep your 5 port junction sitting on top of the stem cover?
I super-glued the di2 stem mount to the stem cover. Not the junction box itself, but the little mount that you'd usually rubber band around the stem. That way you can still take the junction box on and off. You may need to rough up both the mount and the stem cover with some sandpaper to get a good gluing surface.