I've got this old Champion-sized Springfield that needs a little work. The previous owner said he had a gunsmith install a Wilson hammer and trigger. The guy did a good job on the trigger...nice and smooth, no appreciable over-travel and light, but safe pull. The hammer bites me every time I take it to the range. Does anyone make a beavertail grip safety that's pretty much drop in and can a dumb, but reasonably mechanically-inclined person install himself?