If your Savage 110 was made before about 1964 you remove the bolt and pull the safety back. There is a small spring steel cover right at the front edge of the safety button, this can be carefully pried up and out with the tip of a small knife blade. The weight of pull adjustment will be the screw right in front of the safety button, Counterclockwise to lighten, clockwise to increase. Many times this will do nothing for you and if it doesn't your pretty much done as the only other recourse is stoneing the sear engagement something best left to a very good professional. If you adjust the weight of pull screw out to far the safety will not work so be sure and check that. Reinsall the adjusment cover. Most of these rifles came with about a 5 pound pull and 3.5 pounds is about as light as you can get assuming the adjustment does something. I have never seen an aftermarket trigger for these older 110's.