Probably not the spring, but maybe the frame. 50+ years ago I had a large frame IJ in 38 S&W that, in hindsight, stretched the latch. Had that fixed by a LGS, but the next time I shot it the latch stretched again. So I sold it. Didn't know then they were for black powder, that is, very light loads if you are going to use smokeless powder.Well the little gun gets dirty pretty quick even with modern powder. Got it back from my gunsmith today. I haven't got to do any test firing with it but he did. He says the new hammer spring was exactly what it needed. Maybe I can shoot it some in the next day or two and find out for sure myself. I don't want to shoot it alot though cause I remember reading somewhere that modern powder in this gun may have contributed to the weakening spring. Has anybody else ever heard this?