Alan, it is a tool much like a punch except the foot is similar to a fork with out a bend and very short tines. You mark your first hole and place the first tine over the mark and align the tool with your direction of seam and strike with a mallet, punching 4 straight, evenly spaced holes. Then put the first tine in the 4th hole and repeat. You end up making 3 new holes each time. I'll try to find you a source for the tools but in the mean time, start looking in local hobby stores. I can't imagine a leather working shop not having them.