Find a professional gunsmith, one experienced in actual repair of old guns not someone who hangs out a gunsmith shingle because they can assemble ARs, and let them deal with it. PAY what it costs, and if you care about the piece, don't cheap out.
Working on old, obsolete revolvers (in particular, and any gun, in general) where parts are not often available, if they are at all, is not a job for the semi skilled amateur.
Part of what you pay for is that if the smith screws something up he's obligated to fix his mistake at his cost, in terms of both money and labor.
If you're gonna try and "fix" it on your own, you are, entirely, on your own. The best advice is "if it ain't broke, don't fix it", but you're past that point, already. Next best advice I have is pay a professional, if you aren't one, yourself.
Good Luck!