I could be wrong Miqueleter. I checked the hole in the top jaw of my lock, and it is not threaded. I have seen these holes before, sometimes with screws. Maybe a retaining pin was used on some early top jaw screws. Lavin references Espinar's discussion of retaining pins (Fieles / Fiel) that were used on cock and battery screws. See page 164 and 165 of The History of Spanish Firearms.
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