The last page of this link shows the trigger assembly. http://www.lymanproducts.com/lyman/m.../lyc-ml-gp.pdf
Take the trigger assembly out. Leaf/flat spring 55 (trigger main spring) at the back is for the set trigger. Tightening and loosening that spring by screwing in or out screw 56 will make the set trigger pull harder or not.
“There is Truth in the Old Saying, That if you make yourself a Sheep, the Wolves will eat you.”
Benjamin Franklin, 1773