Not much mention about 'upgrading' of finish or partial refinish. I have done it on several of my early nickel plated pieces. I use the kit offered by Texas Platers Supply. I have plated several entire pieces with it and it does a good job, probably not as durable as a pro job but can look as good. On several, where the nickle is worn and I can buff without dulling edges, like side of barrel, back strap, part of cylinder, etc. I can upgrade my piece from 40% to 60% or better. First try was a Colt conversion Pocket Navy, now about 60%, nobody has questioned it after 30 years. My best job is a TL, exc in & original nickel and pearls, received little care outside. Its now about 80%. I will never sell any of them and whoever has them decades from now will never question. Which revives a question about restoration, if the work is as good as original why should anyone care?