I think you can Google GP100 Book of Knowledge, and it will tell you what to do to one.
Add some of Lances Shims, and some Wolff springs and a little fine tuning. I normally start on the Main Spring Strut with a file, and work my way to polishing it.
I stone the Hammer Dog Flat, it will normally be dished.
A really good revolversmith like Ron Power can normally make it even better than I can.
If you have any mechanical skills at all, you can do one a lot of good yourself.
Bob R