Bob, a spiral bit works great for free hand mortising. If you can't do the template, it will let you get really close to the lines and then you can clean up the mortise with chisels.
A spiral bit will cut without pulling the router one direction or another. There are two types, up cut and down. I've been told that the direction is where the frays will be around the edges, so down spiral would probably be the one to use.
Last edited by Darren Wright; 08-12-2010 at 12:11 AM.
To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault