I own the book "The Strip-Built Sea Kayak" and I am in the process of building The Great Auk and I would like to make a paddle with it. In the book it shows setting up some jigs. I understand the octagoning tool but I have a question on the shaft scarf jig. I understand the 10 degree wedge and how it works except for the positioning of it and I am confused on the 8 to 1 inch taper and the angle that the fence is set up on. If I could just maybe get a diagram or the angle for the fence I would appreciate it very much.