If I were doing another, I would probably use that trigger which looks like pictures of the Jard triggers I have seen.
My two tropical rifles have modified Moyers triggers , the modification being grinding off the grooves and rough casting areas, making a very smooth trigger. I has the third screw, and honestly it has been so long since I installed them I cannot remember the function. They did make for a smoother lighter pull.
The others have the Kepplinger triggers, I polished the top rounded surface of the Kepplinger housing where it contacts the sear bar to a mirror finish, and the surface of the sear bar that contacts the Kepplinger trigger . The end result was a very light smooth unset pull on the three guns that received this trigger. The actual pull weight varies a little, and the set pull is around 6-8 ounces.