Wind the screw out to the point where it wont cock and hold and then wind it in 1/4 of a turn and try it. (Make sure you undo the lock screw before trying to move the adjuster screw). There is little range of adjustment on Premiers to my thinking---but that is true of a lot of guns. I take it the gun is lubed ok? What you can do is cut a couple of coils of the mainspring. You do not lose much power but there is less tension on hte piston and the trigger.