help adjusting Hammerli AR20 trigger

[mgh]

I just bought a used Hammerli AR20, and can't seem to get the trigger adjusted. I am unable to get any first stage, the moment I put pressure on the trigger it fires.

I had to pull the rifle apart, as the previous owner had 3 different regulators, and had a 780 fps regulator in it, and I wanted the 560 fps. The regulators each have their own hammer spring.

Here is the page from the manual describing how to adjust the trigger:
[img][img]http://i700.photobucket.com/albums/ww7/ ... ff3530.png[/img]
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I do not understand the difference between trigger pressure point, and trigger slack. Nothing I do with screw f or screw d seem to make any difference at all in gaining a first stage.

As you have probably guessed, this is my first air gun. I have a Kimber .22 rimfire, so I understand what a 2-stage trigger can, or should, feel like, but I am unable to achieve it with this Hammerli.

Thanks for any help.