Hi Daryl
I am also told that the safety is supposed to pop out when the hammer is cocked, but I do not know if that was how they were all made. The originals I have seen and handled were not all that way, but it's very possible that some degree of wear was responsible for them not working properly.

As I said in the 1st post, I have not had a chance to see one taken apart, so I am unsure as to how the parts are supposed to work. I am also sure that different makers would have used different systems.