{HEAD ~ The shaft} 26 includes {TAIL ~ an angularly offset portion} or eccentric 28 which is disposed within the chamber 16 
includes
{ HEAD ~ The shaft } 26 includes { TAIL ~ an angularly offset portion } or eccentric 28 which is disposed within the chamber 16
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH