Plus saw a post where it showed the "first stage" as two bars sliding horizontally until the end is reached and the sear trips. (Or something to that effect.) I guess the adjustment screw is shortening this horizontal stroke. The post you referenced cautioned against setting a knife edge engagement for two reasons: first, an unsafe sear engagement due to bumping and, second, premature wear on the sear. I'm familiar with the first concept with firearms and give any gun with a light trigger the bump test to see if it will trip. Even had one I bought go straight to the 'smith to correct same. What worries me a bit is the second warning about sear wear. These parts should be sufficiently hardened to resist rounding. What is the difference between "tripping" the sear from normal pulls and a knife-edge setting? I will take it on faith that a safe "hair" or "target" trigger is not achievable with this system. That said, I still ask if the original Gamo travel adjustment screw will allow you to go dangerously close to a knife edge setting? I should think it's engineered with some safety margin in place.
ps - This relates to sear wear, in general. One thing that really gets me is the number of people who think nothing of daubing their trigger surfaces with moly pastes, et cetera. Most gunsmithing manuals warn against this due to the dust-gathering effects of sticky solutions which, over time, can cause them to become abrasive to the point of wearing key surfaces. See it all the time on rimfires, too. If it's a true statement, then I would think that it's even more of a no-no in a system like Gamo's. Personally, if I feel the need to reduce trigger friction through application of a lube, I opt for one of the dry kits from Brownell's.
What, me worry???