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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.
Three names, one entry
Every part carries the names it has been given across two centuries of manuals, trade lists and catalogues. You do not have to know the right one.
The modern name
What a gunsmith or a parts list calls it today — frizzen, mainspring, breechblock.
The period name
What the manual in your hand calls it. A frizzen is a battery in period British usage, and confusingly a hammer too.
Your best guess
Misspellings and half-remembered words are matched loosely, because that is how most people arrive holding a part.
A search looks in all of these
Would rather browse than guess? Start by part type, by arm, or by how it fires. If none of that lands it, put the question to Butch.