Trim top flush with sides

Route binding ledges—Binding is the protective strip that runs along the body edges. An L-shaped ledge or notch (properly called a rabbet) is cut into the body where the binding goes. This is a step that luthiers either love or hate. It can be cut by hand, but the router is faster, and (for most of us) produces a better job.

The binding rabbet must be a precise depth and witdth as well as perfectly parallel with the body side. This mahogany and walnut arm lets the router move all around the guitar, following the arch of the back while staying parallel to the sides. (continued)