My point about similarities/differences among Stoeger, Erma, and original Luger was that the later wannabes with toggle systems is that their toggles do not lock the breech by the knee joint locking provided by the originals. They are blowback actuated. Since neither locks like the original Luger, their toggles don't interact with the ramps, and their top ends are effectively in fixed position during the cycle. The similarity in toggle design between the Ermas and the Stoegers is that neither needs to be cammed out of battery position by encountering toggle ramps as the entire top end recoils back in the frame.
Thanks for the link to exploded view, John. Combined with Mike's description, I can now understand better what I'm looking at in Mike's pic. The spring in question is #60 in the exploded view?
The exploded view shows a major design difference, compared to Ermas--the main recoil spring is in the handle, as the originals, and not tucked horizontally into the top end, like the Ermas. The sear setup, linkage to trigger, pressed toggle parts, etc. are different, too, but the main spring was the first thing I noticed.
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