While at an arts and crafts fair I found a new rasp. A guy was making rustic furniture and was using a large rasp that I hadn't seen before. I asked him about it and he said that it was a Farriers rasp. It's used to shape horses hoofs. It has a real aggressive side that removes lots of wood and a finer side that smooths pretty good. It's a large tool and flat on both sides but for shaping necks it looks like the width of the rasp will help to keep things smooth and even down the neck. I am working on a tenor Uke with figured maple body and neck so I will see how it works. They don't cost much. I got mine at Tractor supply for $22.