Working the 1877 Colt Thunderer

Trust me the 1877s have earned their infamous reputation. But what the heck??
They are an iron jig saw puzzle. I've been tinkering around with mine since January. Whenever I can find the time.
Working Colt’s Model 1877 Double-Action Revolvers
The disassembly is not that difficult. Chicoine outlines that part rather well. It's the "Reassemble the revolver in the reverse order of the above" line at the end... that is when the real "fun" starts.
As far as replacement parts both original and manufactured below is a listing of the ones I have been in contact with. Since I've spent a bit of time on this little project I though I might save some else a little research.
http://www.poppertsgunparts.com/
Popperts is a good place to obtain the springs.
Jack First Gunshop - First in Gun Parts - Rapid City, South Dakota
I ordered a Hand, Sear, and Cylinder Stop from Jack First Gun Shop in Rapid City, South Dakota via telephone on Monday. The parts arrived Wednesday afternoon.
Colt 1877 Double Action Revolver
Coltparts.com will has hammers available. Their price is also available upon request. That's P.O.R. on their listings.
Colt Pistol Parts
Wisner has some parts.
Colt Gun Parts ,Bob's Gun Shop
Bob's Gun Shop has a listing.
Numrich Gun Parts Corp. - The World's Largest Supplier of Firearms Parts and Accessories
Numrich also has a listing.
I didn't mention prices. It's not cheap.
If you decide to do the work your self good luck. I've put together some notes and pictures that might be of help. Let me know if you're interested.
I'd go with David Chicoine's recommendation about not firing this thing. Get yourself a Cimarron Lightning. But I have a feeling I might just find myself hauling this old gal off to the range one day despite all that.