The dampener 10 has {HEAD ~ a nut} 12 mounted at {TAIL ~ one axial end} for tightening the dampener 10 onto the threaded end of the shaft 
The dampener 10 has { HEAD ~ a nut } 12 mounted at { TAIL ~ one axial end } for tightening the dampener 10 onto the threaded end of the shaft
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH