That does look a bit rude but with a good soaking and cleaning would be perfectly functional. I think your skill level is plenty adequate if you choose to dismantle it. It looks like you have the hammer cocked so have the main spring compressed almost as far as necessary to remove it. If you use a small crescent wrench to hold it there or the small needle nose vise grips I mentioned before to compress it a bit more then using the crescent wrench to hold it, You could release the hammer and pull the spring.. CAREFULLY as I mentioned before also. Make sure you punch the pin on the outside to loosen it before pulling the spring out. Can't emphasize that enough. Do not pry the spring off the inside of the lock plate. Once the spring is out, the rest is easy. 4 screws + the hammer screw if you choose to try and remove the hammer, and it will all come off the plate making it much easier to clean. To start with I think I'd first soak it and see how clean it comes out. If you have lacquer thinner a soak in that would loosen the oil crud to where a tooth brush would remove it. You're doing great Sean; no need to rush anything at this point. I think you'll be pleasantly surprised how good it will look once you clean it. You have the long cold winter ahead of you, right? I know about that....
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