I should be getting my Wolf hammer spring any day now for my Charter Arms 38 UL stubby. It has developed a light hammer strike, that has gone from once in a while to every time. I hope the spring does the trick. If it does,I'll even bob the hammer. I bought for double action use only anyway, and it fits my pocket very well. If the spring fails to do the trick, I hear a shim is an option as well. The spring would be an easier fix for my limited gunsmithing abilities.