Re: F.I .380 Model D
Since it is its own spring, you could try tuning it by clamping the bottom part (inner side) in a vise and tapping the top (outer) part with a brass or plastic hammer. (Note the word is "tap", not "bang on as hard as you can".) That is the way folks have "tuned" M1911 extractors for years. You risk breaking it, but it doesn't work now.