Whatever you do, don't loosen the main spring tension screw. It may make the trigger pull lighter, but it may cause misfires. I took a 686 to a so-called master gunsmith for an action job. All he did was fill the works with oil and loosen the tension screw. I cleaned it out and installed a spring kit, which helped. I had a few misfires in DA and realized I had not properly tightened the tension screw. I tightened it all the way and have had no problems since.