As regards the question of main spring tension helping to keep the toggle train in it's locked or "battery" position, the answer can clearly be demonstrated by this experiment: Raise the toggles until the sear engages the firing pin and the toggles are held in the raised position. Turn the pistol upside down and squeeze the trigger. The toggles will slam shut and remain so. This would not be so if main spring tension was absent. I've even seen some Lugers with sufficient main spring tension to prevent the toggles from remaining raised even with the sear/firing pin engaged.
Removing the left grip panel will clearly show that there is still spring tension being applied by the main spring when the toggle train is closed.
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