I've been shooting a Wolf Power Rib Mainspring in my 617 for about a year and after this thead I decided to check it out. I use the McMaster's screws and mine was turned in 5 times to get my 8 pound trigger pull that made my gun work with most .22 ammo.



I ordered some shorter springs because my mainspring was just about toughing the back of the frame leaving no more adjustment.

I put a Miculek Mainspring in and to get the same weight pull I only had to screw it in 3 1/2 turns. This gives me more adjustment. With the way my gun is set up now I need that weight. I can get away with 7 pounds for Federal BYOB ammo and Golden Bullets but need the extra weight for Mini Mags and Norma Tac 22.

I never ever knew that shortening the strain screw was a thing until I joined a bunch of forums ( now only a member of a very few) so guess how many Ive messed with. Maybe my dumb luck but to my knowledge I have yet to buy a revolver with one that has been messed with by anyone else. Pretty much the only revolver I have ever bought with a really nice trigger was that 627PC gun. Its always reliable.

Speaking as a graduate of the S & W Armorer's School we were taught that the strain screw should not be shortened and that it should always be screwed in tight. The only modification to the strain screw was to chamfer the end slightly. I have used Wolf reduced power spring kit in several of my N-frame revolvers with no problems, I installed the power rib mainspring and used the mid range rebound spring. The resulting action was smooth, SA & DA pull weights reduced and have never had any ignition problems.

Marksman, your education from S&W Armorer's school is directly opposite the S&W Armorer's Manual, page shown below.

Stu

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My training at S & W Armorer's School was 40 yrs. ago much has changed they didn't even have a manual in those days. Thanks for the updated information.

design engineers, yes. but then the process improvement engineers and accounting dept get involved, and things go downhill.

I worked at an aerospace/defense contractor for a long while. contracts and accounting dept really screwed up a lot of good designs.