The Rules Have Changed! Complicated knots are now within reach of just about anyone! Jig Pro Shop is proud to introduce one of the easiest, most intuitive, knot tying mandrels ever produced. Each of these Mandrels will easily guide you through the knot tying process with the directions literally etched right into them. No more messing around with instructional books, trying to follow different numbering patterns, pins that constantly fall out, or printing out patterns and trying to fasten them to a mandrel in hopes they will work and all line up properly.