I have written an article about improving the triggers in Smith & Wesson revolvers. This is not a tutorial article about changing springs or stoning parts. Instead, it is an introduction to some general principles about how revolvers work.
Improving the trigger on Smith & Wesson Revolvers
Part one of the article covers general concepts about gunsmithing and
discusses the meaning of a "good" trigger. If you want a better trigger,
this part will be useful whether or not you want to do the work
Part two of the article contains more detailed information that will
be helpful if you want to try working on your own revolver.