I recently bought a Ruger Standard Model .22 pistol (ca. 1954) in excellent condition which came with two mags, one being the original, the other being for the later Mark II. The original mag has the zig-zag follower spring which seems to me to be fairly weak. I have tried stretching it, but that provides only temporary results. While the pistol seems to work fine with a slightly modified Mark II magazine (which uses a coil mag spring), I would like to make the early Standard magazine workable, as it is otherwise in excellent condition. I have looked on the internet, and can't find any sources for a new and correct replacement zig-zag follower spring. Any ideas?