This pivoting action may also be accomplished by {HEAD ~ the turning operation} of {TAIL ~ the rear lever handle}  
of
This pivoting action may also be accomplished by { HEAD ~ the turning operation } of { TAIL ~ the rear lever handle }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH