Tighten vision metron aero brake lever I don't see the screw to tighten on the Vision Metron Aero Brake Lever
How do I access tightening bolt?
perhaps this video might help. I'm not sure if you have the same brake levers.  The part where he installs the brake levers is about 6 minutes in, which the link should go right to.

There's a small hex key bolt on the outside of the brake levers. You should be able to see it in the following picture, I have circled what I'm pretty sure are the screws you are looking for.  



The installation instructions linked to from the page you linked to shows the "fixing bolt" labeled as "3" in the following diagram