I put a Wolff standard power ribbed mainspring in my 686 about 20 years ago along with a 13ib trigger return spring. Smoothed out the trigger pull and lightened it enough that more than one shooter has asked me who did the action job.

Recently started getting misfires (I was using rifle primers to set off Mulwex AR2205 (the replacement for Hogdon H4227 powder which I used to use exclusively in .38 special). When I got a new ribbed mainspring and trigger return spring for my S&W Victory model I made sure I bout a 3 spring pack and replaced the now 20+ year old one in the 686 again too.

Worked great.