Take two or three pieces of thread double the length of the hat, tie a knot in the center. Sew the hat seam so that one end of the string is in the hat and the other end with the knot is on the outside end that is tapered. Sew the tip with the thread caught in the seam at the tip, using small stitches. You do not want the knot to slip through. Grade seam, but DO NOT cut thread. Holding onto thread string from inside hat, gently pull. It will turn the hat and pull the point at the same time. Trim thread and then pull the knotted thread out from the inside. Hope you understand what I am trying to say; I am better at showing than explaining in words.