Here is an example of a riveted strap stud setup the strap can pivot on the rivet but it's a snug fit . The patterns for holster and pouch's came from Tandy many years ago and we're changed enough to fit a Ruger old army.
The stud attachment in the plan is mounted to a leather disc and that is sewed to the outside of the holster so the gun is protected from the back of the stud .