Hello:
Raf said, "and a separate Manual cover was not ... perfectily rescated illustrated in your example."
However, in the excavated specimen is clearly sees the pole over turned the manual cover. Nor do we see that media had mounted (half-cock) or a snap hook. I'm sure it is a threaded screw and the cover was a simple thin film that has been lost, eaten by corrosion. The security method, as in all snaphaunce is to keep the rake (frizzen) despondent.
Precisely, in his thread "Leonardo s snaplock, etc.." In his post # 4, last image, one of these keys (locks) it sees, with rake (frizzen) dejected, and the cover on the bowl (pan) although the spring (mainspring) acts from the bottom up.
In the last image of this post a key (lock) sees no cover, because it has safety hook.
Fernando K
Sorry for the translator
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