The driving mechanism rotates the tubular member and electrode about {HEAD ~ the elongated axis} of {TAIL ~ the tubular member} 
The driving mechanism rotates the tubular member and electrode about { HEAD ~ the elongated axis } of { TAIL ~ the tubular member }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL