Pin fire cartridge assembly question

Hi All, I just saw the new issue of IAA newsletter, and it looks great! I’m always amazed at how well the articles are written. I saw an image of a cross section of a pin fire cartridge, and I was wondering if anyone knows of an article on how they were assembled? How is the primer cup held in the the bottom of the case, and how is the pin held in place so it doesn’t slip out? These seem extremely tedious and time consuming to assemble. Was the process ever automated, and if so, how was it done? Or were they all assembled by hand?
Thanks!
Joel

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