I have a set of Ketland parts here with a bronze plate. This not my regular Ketland but
a small one with a double throated cock or re-enforced cock as some call it and a heavy frizzen that can be equipped with a roller if caution is used. I made a number of these over years of the "Flint Hawken"craze but they had steel plates. There are no cast internal parts for it that I ever saw and it takes a good bit of experience to make this lock otherwise. I remember making one of these years ago for someone and made a steel sleeve (bushing)for the tumbler to turn on and an impact plate for the stop/shoulder of the cock to strike on firing.It would be a neat lock for a special project and when finished,one of two on the planet.
Bob Roller