text: 3) Here is the jig in action. The first step is to route the sides, neck/heel blocks flush and parallel to the form. To do this, I use a 3/8&quot; bit with the nose retracted so the bit flies over the sides and kerfing. The neck/heel blocks will require additional planing by hand as the jig will only cut ~3/8&quot; into them. This is done twice, once for each edge. Now I have a rib/blocks assembly that has perfectly parallel edges which are also parallel to the form when inserted and 'bottomed out'.