Ok, I understand how it works now. The only reason I mentioned what I did in my above post is I bought a GPR that has the double set triggers. No matter how hard i pulled on the rear trigger I couldn't get it to set. The screw was turned in all the way. I ended up installing a longer screw, and then it was easy to set the rear trigger. Of course as you guys explained it also set the front trigger lighter, but I never knew that, because I couldn't get the rear trigger set with the short screw.
In talking to Lyman they told me they use the short screw as a safety measure to keep guys from setting the trigger too light. That didn't make sense to me at the time, because I thought the screw was just setting how light the rear trigger was. Now I know it's setting both triggers lighter.
