This is one of the easiest ways for a beginner to upgrade his existing sighting system. Back in the day I must have reworked a hundred CVA Mountain Rifle, and Frontier rifle, sights. These are pretty easy to find at gun shows and shoots, and are a real good primitive sight. Replica muzzleloader sights that rely on a coil spring aren't nearly as good, and often don't stay in adjustment. The old CVA's were made of spring steel, and adjusted with a screw that contacted the barrel. Once set they stay where they are supposed too. They had a real thick sight notch, that could easily be reduced with a small ball type grind stone in an electric drill, or Dremel, run on low speed.
I have also bore a couple of these through, and used the soldered on method mentioned previously, with good success. I even made a peep sight for an elderly shooters pistol out of one of these.
Hungry Horse