I wrote an article on my web site presenting three kinds of edge burnishers for lather working.
La Belle Note - Edge burnishers
Here is the second one, a small spindle to be used on a Dremel like high speed tool :
(you see the chuck ? )
This burnisher has a 3.2 mm shaft that mounts into a Dremel-type high-speed spinning tool chuck.
This tool is well adapted to small parts, when the contour has curvatures with tight radius.
Dremel type tools are limited torque tools, so we can not push very hard on the work. The tool can, however, be used with a flexible shaft connected to a drill press or lathe for example.