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Former VSM Regional Endorsed Instructor
My two cents, I had a problem with occasional light strikes after installing an aftermarket spring kit with one of my J frames. It turned out the spring in the DA sear was kinked (likely from the factory as I never touched it) and the lighter springs would not always be able to overcome the extra resistance. It happened about once every cylinder.
Finally checked and replaced the spring, and have not had a problem or light strike since.
Try tightening the strain screw just a little.
The combined triggerpull weight of the rebound and main spring is not the only influence on ignition. Friction will make the triggerpull harder and the trigger characteristics unpleasant. A misaligned hammer might loose force by binding on the frame and could maybe need shimming. Burrs inside the rebound slide, rough spots on the rebound slide or poor mating to the frame can increase friction.
Just changing the springs will rarely lead to phantastic trigger characteristics, only a lighter pull.
J. Kuhnhausen has written an excellent guide on how to work on the S&W revolvers and reading it will help to understand the gun much better.
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