Hi G.T.
Rolf Gminder told us that they had a lot of problems with the main springs of the post war Parabellum initially. They then called on the guy who had designed the springs for the MG42 during WW2. He was able to come up with a spring solution that worked. If I remember correctly, this guy had developed the intertwined coil springs used in the machine guns.
An interesting side note is that Rolf took out a patent on a design for an adjustable main spring for the Mauser Parabellum. The solution was actually quite clever. The bottom of the spring hook was constructed with a threaded bushing, where a set screw could be screwed in. By adjusting this set screw, the spring tension was increased or decreased.
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