Look AERODESIGN HANDLEBAR 2 Manual página 37

ROUTING DERAILLEURS (Figs. 1 & 2)
Mechanical Unit : The derailleur casing goes in through the last hole of the handlebar
end cap (31) and comes out through the small hole beside the brake knob (21 & 22).
Depending on the handle model, the derailleur casing must pass either through the
outer groove of the handlebar (Fig. 1) or under the handlebar (Fig. 2).
Electrical unit : The route is the same. Thread the wire into the outer groove of the
handlebar (Fig. 1) and fix it with sticky tape.
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