Don't have anything i can offer other than I'm sorry to hear of your experience with the "gunsmith" and the result in regards to your family heirloom. The OP is a nice pistol - I have the older brother, Army Special - same thing though. I really enjoy shooting it. Hopefully you can find someone who knows what they are doing in regards to a Colt and they can get if fixed up for you. Best of luck!
If a pair of '51 Navies were good enough for Billy Hickok, then a single Navy on my right hip is good enough for me . . . besides . . . I'm probably only half as good as he was anyways. Hiram's Rangers Badge #63