{TAIL ~ These parts} are identified with reference to the position of {HEAD ~ the tool} shown in FIGS 1 and 3 
{ TAIL ~ These parts } are identified with reference to the position of { HEAD ~ the tool } shown in FIGS 1 and 3
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH