if you ever do need to remove a hammer - the disassembly of a breechloader lock is not much different than a flintlock,
http://www.muzzleloaderbuilderssuppl...kassembly.html
"Place the lock on a partially opened vice, inside face down, so that the jaws of the vice are open slightly wider than the tumbler, and the lock plate is sitting flat on the top of the jaws. Using a pin punch that is smaller than the hammer screw (allowing the punch to reach the bottom of the threaded hole in the tumbler), lightly tap on the punch to drive the tumbler out of the hammer and out of the lock plate."