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Had the same problem @miro_o had. Shimano manuals say you need the fancy plastic thing to see which way you have to route the cable around the bolt to get the correct cable angle. Fd failed to shift from the small to the big ring after two rides so I brought it to the LBS in the end. :(
Just push the dérailleur a little higher with your hand then tighten bolt.
Tension should be quite tight, a lots more than usual.
No need for that fancy plastic thing.