The next step would be to turn out a bore and fit a mandrel into it.
On the inner end of the mandrel put a block (F) of hard wood.
The discs are made by pouring lead round the screw-nose of the mandrel.
The disc is, of course, mounted on the mandrel, and the work on the slide-rest.
Claim—Constructing shells for firearms by forcing the metal into a mould around an internal ...