Yeah each bow will require a bit different string, especially if you set up your jig as AMO length. That's what I did and when I put the peg in for a 68" bow, a string will come out perfect for my 68" hill style bows. However, when I make a string for my mild r/d bows which are 62", I have to use the 64" peg slot otherwise the string is too short. I recently built a sting for a friend's recurve. Boy that was a complete guess, but I got lucky on the first attempt and with a little stretching, it worked out perfect.