I vote for the farriers rasp too, removes wood fast but no risk like a draw knife were one cut to deep can turn your 50 lb bow into a 15 lb bow in a second. Draw knife is a great tool, but there is a learning curve, a roughed out stave that you paid some good money for probably isn't the best thing to practice on. Oh, and you can always get a free farriers rasp from a farrier, they get too dull for hoof work after a couple of days, so they usually have a pail full sitting around, they are still sharp enough to do good work on wood.