Here's a couple of pics of some factory Winchester PG guns.
A Win 92 pre1900
Notice the cross pin. The stud sits a little higher on this one than others I've seen. This rifle has been reblued and worked on (and abused!)


Win 94 PG rifle from around WW1. There's that cross pin again! A better condition gun. You can see the outline of the stud on the tang outside surface.




Last at the bottom of the pile was the '73. This is a second model '73. Surprise!! No stud used on this one. Maybe they did on the later model,,I don't know. Don't happen to have one lying around.
They just D&T directly through the tang on this one.



The Model 90 I did have the experience of removing the stud and making and replacing one for was in fact rivited into place from the outside surface of the tang. Was this the way all were done?,,I don't know. This particular one was. Maybe it was only to further enhance the close fit between the stud and tang in an attempt to hide the joint. There was a definete small countersink cut for the process on the outer surface for it.
I've never replaced one on any other model Winchester other than that one model 90,,so I don't and wouldn't make a blanket statement as to how they were done. They were always changeing methods. That's eveident from the 3 pictured above.
Hope these help.