this is how i fix broken fireing pins on martini,s. hilti nails, hard , tough and not brittle.
i cut the point off just short of the full OD of the nail, this leaves a natural taper
for when u press it in the hole. use # drills and woirk up slowly. this is done in the lathe. i then drill a wittnes hole to let the air out when pressing the hilti nail in.
i use 680 loctite and the littlle grouves in the nail carry the locktite in the hole. i cut the nail of a little longer than needed before pressing it in . u then machine the fireing to size. i have done 4 of these and non have failed yet. i have used these hilti nails and studs for makeing shotgun and rifles for years and very good results.
this fireing pin is from a greener 12gauge shotgun. parden my poor wrighting skills.