The first tubular member 21 has {TAIL ~ a free end} to which {HEAD ~ an end connector} 22 is mounted 
to is mounted
The first tubular member 21 has { TAIL ~ a free end } to which { HEAD ~ an end connector } 22 is mounted
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL