Yep, Brownells. Order the kit and a Bisley single six hammer seperate. The SS hammer only comes in blue. If you want to remove the blue put it in vinegar for a few minutes and polish.
Get a good file and some 320gt paper and go to town. Mine took about 4 hours total. I also keep it clean and have not had any problem with the blued hammer trying to rust. I shoot it on Small Bore Hunter Pistol Matches every month.