They are designed for broken over-torqued studs and work well enough for them - yours looks pretty clean
Studs which have broken through having taken up residence for 60 years and becoming thoroughly rusted in and heat treated, as Schlitz noted, are a different matter, which prompted my comment above.
Depends upon why the stud/set screw broke
Best Wishes
Andrew
Andrew
Thanks for the insight, I am always up for learning