{TAIL ~ a peripheral surface} for engaging a pulley cable for causing {HEAD ~ said pulley} to rotate 
{ TAIL ~ a peripheral surface } for engaging a pulley cable for causing { HEAD ~ said pulley } to rotate
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH