A real gunsmith can work on most any gun. The "oh, he specializes in single actions" is a bunch of BS. You have to be beyond hack status to damage a frame. Losing a pin or spring is understandable; frame damage is not.
1. If he's a real gunsmith, he should be able to work on any gun and...
I let a guy named "Cow Anus Jones" mess up my car once. I guess the lesson is to not let people named after barnyard animal parts work on anything you value.