I find that the 14-pound pull or thereabouts on my Ruger was a bit much and affected accuracy so I wanted to lighten it up. I know it is by no means a target gun but it couldn't hurt so I ordered the SP-101 spring kit from Wolff Gun Springs at www.gunsprings.com.
It was 10 bucks plus the shipping, so around 14 dollars. It comes with four springs, three different weight hammer springs, and one trigger spring. They say if you go with the lightest hammer spring you should replace the trigger spring with the one in the kit.
This pak contains 1 each 9, 10, and 12 pound reduced power hammer springs for Ruger SP-101 series revolvers and 1 each 8 pound trigger return spring allowing adjustment for lighter and smoother trigger and hammer action. Note: Factory trigger return spring is 10 pounds, factory hammer spring is 14 pounds.
Here is a video that shows how to do it. Follow all the precautions they say about not pulling the trigger when it's apart. I found out the hard way because somehow I pulled it.
I don't know how but I moved the trigger pawl, and a teeny tiny spring and plunger went flying! I looked and looked but never could find the parts. No touch trigger if you can help it! Note that I did not disassemble the trigger assembly as they do in the video, all I did was replace the trigger return spring which was fairly easy.
Here is the complete trigger assy.
^^^before I wrote on the image^^^
I ordered the parts from Sturm-Ruger and they sent them at no charge and no shipping! Can't beat that!
I just got it all put back together and the trigger pull feels like it's a little more than half of what it was! When I get to the range, I'll post a range report next week sometime. It wasn't that hard once I got it apart and after decades of working on tiny parts and stuff in transmissions, it was fairly easy except for the lost parts. So if you think you wanna give it a try, go for it!