Here I'm using the Arbor Tech in a horizontal position and "sweeping" or "brushing" the surface.  Very little pressure on the tool is used here.  This goes a long way towards cleaning up the "chop" left by the mass removal step.  Note the sandbags that act like pillows under the piece allowing me to move the piece into nearly any position.  The spikes on the exterior of the burl dig into the sandbags fabric and do a great job of holding it. The bags should be only about 1/3 to 1/2 full.  This way they can be easily "fluffed" up to fit the contours of the burl.

After "sweeping"  the surface I'm ready to start in with the Kutzall grinders. 

 I'm using the medium grit grinder here to further refine the surface.  Its also used primarily in a "brushing" or "sweeping" motion.  Fairly firm pressure can be used here, as opposed to the brushing technique used with the Arbor Tech, which is truly a light pressure procedure.

 The Kutzall grinding is complete and the piece is ready to sand.

Flattening the bottom. This is often done as a first step by me on the bandsaw, but the decayed front left me unclear as to where the bottom would actually be. A special note here...if you are not fairly competent with the bandsaw....don't try to cut the bottoms off of the burls...use the method shown above.   Sometimes the Arbor Tech can do this same procedure....but I always clean up with the Kutzall.

Sanding complete to a 400 grit.  An no sign of the decay except that which I chose to leave in the upper left hand corner. 

   Oiled.  Click on the pic to see another view of the piece.