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@dancing james
mine has 4 holes on the down tube
2 drive side close to the head tube
1 non drive side close to the head tube
1 at the bottom by the BB shell
one hole on the drive side is for brake hose that feeds through a guide all the way to the hole near the BB shell
on the drive side i shall use the other hole for the Di2 cable that will then run down to the BB and go up into the seat tube. inside seat tube will be the junction box, and one cable will go from there up the seat tube to the hole for the front mech. another wire will go down from the junction box, through the bb shell and then along the drive side chain stay for the rear mech
on the NDS of the frame there is another hole (opposite the Di2 hole) for a dynamo cable to be fed through the down tube and then back up the seat tube to connect a rear light.