wzak, The low end adjustment is the last thing to mess with. Get the engine running first.

That said, the screw inside the blue collar is the low end adjustment. The blue collar is a limiter that is attached to the low end adjusting screw - It is designed to keep you from turning the low end screw too much.

That said, there are some Evos that were not set up properly. But don't worry about that right now, just get it running right and get help doing it.