Stallones,
I've had work done by this shop. Amazing work. Many gunmakers/smiths use them. The work is crazy precise and the cost is reasonable too. Contact Del Whitman if you need a better recommendation than mine. And while the gun is in there....have them touch up the locking bolt and the hook....refit it when it comes back...it'll ready for the next 150 yrs.

http://www.microprecisionwelding.com/gun-repair