Good luck with that one. I dont mean to be rude, but why do you want to convert an original double trigger Smith to a single trigger? Your best chance is to find a parts gun from some old gunsmith, unless you find a member who has had a number of extremely unsatisfactory SST experiences and is wanting to never see one again. Unfortunately I doubt anyone will be willing to part with theirs. If they do however, it will be costly and even more costly to convert. It would almost be cheaper to buy a Smith with one already installed.