Talking about the Charles Moore pistol and specifically the set trigger.
Have you removed the set trigger from the stock? There should be an internal adjustment screw on the trigger plate to increase the tension on the set trigger lever. You should be able to increase the pressure on the lever and have the necessary force to trip the nose of the sear from the tumbler.
It does appear from the Pedersoli Part Diagram that the set trigger spring can be adjusted internally.https://www.davide-pedersoli.com/uploads/prodotti/S305.pdf
Have you removed the set trigger from the stock? There should be an internal adjustment screw on the trigger plate to increase the tension on the set trigger lever. You should be able to increase the pressure on the lever and have the necessary force to trip the nose of the sear from the tumbler.
It does appear from the Pedersoli Part Diagram that the set trigger spring can be adjusted internally.https://www.davide-pedersoli.com/uploads/prodotti/S305.pdf
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