Good luck with the .019 serving. I think you're on the right track, although as you said, it is possible that they used .019 on the string when they made it. Either way, if you get into string making or need to reserve other strings, you'll eventually need some .019, so it won't go wasted. Hopefully you also either already have or ordered a string server tool. I have several different ones, and they all work. If you want the Cadillac of string servers, get yourself a Beiter. The same thing is true with servers as with serving. Eventually you'll want several different servers with different sizes of serving on them so you don't have to reload a server every time you want to use a different size of serving.