I donāt have a 686, but my experience has been much the same as Jeppo with strain screw tinkering. I tried different length set screws that would allow me to run it all the way in without it protruding as well as backing out the stock strain screw. I use Federal primers, but finding a sweet spot for reliability was elusive. Whatās more, Iād often find that, as I ran a few hundred rounds through the gun, the strain screw would back out to the point of light strikes again. I settled on the Wilson spring kits and now have them in my 66, 617, and 10. Iām. Dry happy with the results. Strangely, Iāve actually gone back to the stock trigger return spring (the Wilson kit provides three different reduced weight springs in the kit) in my 66 because I kept short stroking the trigger when I sped up. With the reduced main spring I get a much lighter pull and 100% reliability. I think itās $20 well spent.