THanks,
I will be taking it slow and easy (and have a working plan before I dive into the spare cylinder (it will need work at the front end for the cylinder retainer, and the back for the star ejector). I suspect the brass protrusion is going to be dependant on extractor groove geometry on the brass as well as thickness of the moon clip Perhaps I am overthinking this - but I like to overthink things a bit Before removing metal on a lathe!