My new to me 686-4 has a trigger pull that is too light. Is there an easy adjustment (strain screw or something) that I fiddle with to change the pull?

I did have a 'smith look at it after I bought to see if the previous owner had worked on the internals, and it looks as though he did not. So, at least I have a baseline starting point.

I'd like to hear from y'all prior to messing with it.