I don't do that much to them now. Clean the gunk out, new spring and seals, grind the ends of the spring, soak the seal in some kind of non petroleum oil. I just stick the ends of the spring in the can of molly, just a couple of coils. Put some molly lightly on the spring guide. A couple of mollied up washers in front and one in back if it doesn't interfer with the sear. Simple stuff.