[mrpogie]

This is how I shape out the lip using a 1" drum sander in my drill press. I go back and forth from one side to the other to try and get it to come evenly. In the second picture the first view is where I cut the top on the bandsaw to remove a good chunk of stock and save some time. Make sure you stay at least 1/4" away from the line or you will get a saw kerf that is deeper than you are going to sand. The next three views in the second picture show various stages of what it should look like while you are sanding up to the lines. On the first plug the drum sander make take it's own slightly different shape than the line you freehanded, that's ok. It's more important to try and not go past the depth marks on the top and sides.