https://www.rootschat.com/forum/index.php?topic=247300.0From above
Apparently the occupational term is an Action Freer, Gun Lock Freer, Lock Freer, who adjusted a guns lock actions after they had been fitted by an action fitter, filing them, where necessary with a very fine smoothing file.
As a filer was the general term for a man who dressed metal articles that had been cast, forged, pressed, stamped, wrought etc.,in order to remove rough edges, then they would probably have been employed in the manufacture of locks, but whether they would be specifically called a 'lock filer' is open to question .
Mike
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