I have a SA Milspec. And, there are a couple of things I want to do to it. I really want a beavertail. I get quite a bit of wear on the web of my hand when I shoot. I also want a flat MSH (no biggie, that's a side note, we won't even address that). Now, my paycheck was good to me this week, and I'm thinking about doing the install myself. But, I'll have to file off some metal. I'm very confident in my capabilities in doing this part, but what about the finish? I'll obviously lose some in the area where I file. Can I reapply a Parkerizing in my kitchen, or do I really need a smith to do it?