Peter Breu replies: I believe Dragon rasps are far superior to Nicholson or European rasps. Dragon rasp teeth are individually hand-struck on both sides of each file, leaving a slightly random pattern. This reduces chattering and wandering, giving a smooth but aggressive cut. Go to www.stewmac.com then search for “dragon rasp”.
Jon Siegel replies: MSC Industrial Supply (www.mscdirect.com/products/files) has an excellent selection of Swiss and Nicholson files.