I took a look at my marlin 81DL, as it has a very stiff trigger. Springs in this model are too small to sub with a "ball-point pen" spring (at least the ones I could find here at home)... So, we just started doing a little snipping on the existing one, and a little honing on my trigger group parts. After about 8 attempts, it is very nice compared to when I started. I dont have a trigger scale, but it has to be a least half of what is was. and it breaks just like glass. I always use hard arkansas stones for this. I have one that has very sharp corners, which works great for trigger work. I hope to put it on paper tomorrow and see how much smaller my groups are. After doing trigger work, ALWAYS cock the firearm and strike the butt several times, hit the side of the stock, etc..to ensure the hammer and pin stay cocked. I always do this with either a snap cap in the chamber, or a spent brass hull.
Dave