Stan, Welcome to the Forum. I'm unaware of the posting you cite, or anyone offering a #2 Old Army parts kit. Those of us who have a stash of Model 2 parts, hold on to them as they are hard to come by. Popert's Gun Parts has quite a few S&W parts, but whether he has any #2 Army parts, I don't know. The spring you need is fairly simple to make, and if you have the broken parts of the old spring to copy, and basic skills in heating and tempering springs, it can be done using a piece of old alarm clock mainspring. Otherwise, plan B is to look for a junker Model 2, or Model 1 1/2, with a good cylinder stop spring to salvage. Good Luck, Ed.