Spyrograph Rosette Jig

Bo Walker's Spyrograph rosette jig.Here is another from Bo. Its a "Spiro-Graph" for grown ups. The patterns are the asymmetric sound holes for a Selmer reproduction that he is making. The templates are made from thin model plywood. The disks are have a radius of the I.D. & O.D. of the rosette. By holding the template in place and using a pencil as the axle, he rolls the disk around the template for a perfect layout.