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Identification
Search by what it is called now, what it was called then, or your best guess at the spelling. All three resolve to the same entry.
Matches
The reference
The component itself, described once and linked to every arm it appears on. This is where the identification notes live.
Holds the flint. Called the hammer in US usage, which is the reverse of British usage — a frequent source of confusion when reading period sources.
Matched “cock screw”, a recorded name for Jaw Screw. Period, regional and trade terms are all filed against the same entry, so either word finds it.
Tightens the top jaw onto the flint.
Engages the sear at the rear of the striker.
The reference
A component as documented against one pattern rather than in general — the frizzen of a Model 1816 rather than frizzens.
None of these it? Describe it to Butch — a photograph and a sentence is enough — or post it on the wanted board so a dealer can offer you one.