Kyrie,
Irrelevant or not, these are your words.
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Respectfully, no sir. What keeps the toggle closed is the rigidity of the toggle train with the toggle train pivot point below the centerline of the toggle train, The main spring plays no direct part in keeping the toggle closed.
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Also, it does not matter which recoil spring we are discussing, the toggle assembly has come under spring tension when the toggle assembly is in battery. Simply lifting the toggle knobs on a Luger with either spring will demostrate this. Has it occurred to you that the toggle train is not rigid, and with each firing has three toggle points that move freely when the tension of the recoil spring is overcome, and are brought back and held in battery by the tension of the recoil spring?
Irrelevant? I don't know what it had to do with the discussion, but to say the Sharps-Borchardt (Model 1878) was "fairly" successful is like saying the Edsel was a smashing success. A whopping 22,000 in sales of the Model 1878 is hardly successful by any measurement. Without the almost 12,000 in government sales, it would have been a financial flop.
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