In FIG 10, it is shown how the outer part 3 has been designated with {HEAD ~ appropriately shaped gripping surfaces} 19, which are suitable for compression, {TAIL ~ traction}, and torsion 
In FIG 10 , it is shown how the outer part 3 has been designated with { HEAD ~ appropriately shaped gripping surfaces } 19 , which are suitable for compression , { TAIL ~ traction } , and torsion
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH