Take a look at some of the readily available turning tools, (Sorby, Crown, etc.) to see the shape of what they offer. Most of the vessel hollowing tools have a curved neck (swan neck) shape with an adustable angle cutting tip. Follow their lead and you should end up with something that works well. Or, watch for one of theirs to go on sale. http://www.woodcraft.com/family.aspx?familyid=5023
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