Buzz,
I'd take Mr. Apperson's advice [I'd use an 's', but I alawys get castigated for it;-)] .. fast. Not quickly, FAST!
If your situation is from hinge pin wear there is a process known as 'plasma spray' that I believe is being utilized by a well known gunsith [K.E.; I can't spell] in LA. Perhaps Bill S. would care to send you a PM or post here about that. It is minimally invasive, when done/applied correctly and can be better than new.
Good advice indeed. Plasma spray does not produce the heat zone input that TIG (tungsten inert gas) welding does- I am always cautious when someone wants to TIG weld certain areas of double guns- as heat moves or transfers, and from the thicker mass of metal always towards the thinner mass- TIG welding to build up a top rib extension (LC Smith- Ithaca NID, AH Fox- and others) you want to remember that the rib extension is either brazed or silver soldered in place- depending on the maker and vintage of the gun- and excessive heat input can cause that braze or solder to migrate and loosen- and then you will have a real problem indeed.
