In watching the Cindy Drozda DVD on the Finial Star, she is using a "Vortex" tool. This looks to be nothing more than a piece of drill rod that has been honed with a flat surface at an angle to the center of the rod, and then ground with swept back wings, and undercut to get rid of the excess heel. She uses the tool for crisp cuts on small details with great success.
I have looked for a source without luck, but it seems one could make a "Vortex" tool easily enough. Any experience with this little tool?