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If I remember right, Parker Hale came across a good supply of stripped Springfield bolts and designed the action around them. P-H had to make the bolt sleeve, cocking piece and firing pin. The firing pin was threaded in and had a locking screw, similar to a Lee Enfield.
I had to fix one that the guy screwed the firing pin in too much by one thread, and the rifle would not fire. I undid the set screw, turned the firing pin back one turn, and it then had the proper firing pin protrusion and fired every time. Another case of someone who did not know what they were doing, and "took it apart for cleaning."