If you take the trigger spring out (the spring that the adjustment screw compresses) and remove a few coils, then reinstall, it will adjust down much lower. And also it can still be adjusted higher by just tightening the screw more.
Yep. I found a great explanation of it on a web search. Mine still would not get low enough-hard spring I guess. I removed the spring and replaced it with a spring that was the same size, but softer. Mine now rests at just under three pounds consistently.
