{TAIL ~ The force} necessary to rotate the elongated tubular member 30 and thus electrode 42 is provided by {HEAD ~ an electric motor} 68 disposed within framework 37 
{ TAIL ~ The force } necessary to rotate the elongated tubular member 30 and thus electrode 42 is provided by { HEAD ~ an electric motor } 68 disposed within framework 37
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH