I used one of those locks in 1967 to build my first flintlock. It had a bridle, but no axle on the tumbler. It worked anyway. Your stock also looks like a Dixie precarve from that era. I used one on Ole Betsy (We were not too original in those days.) We had fun with that rifle, and it really makes me appreciate modern locks and vent liner. Ole Betsy used to go chccck.........ssss...Boom. If you could shoot that thing without flinching, you were either smoking funny cigarettes, comatose, or both. At the time, it was the most expensive and best rifle I had made to that point.