The crowns of the two upper pulleys are offset to the right and {HEAD ~ the crowns} of the two lower pulleys are offset to {TAIL ~ the left} 
are offset to
The crowns of the two upper pulleys are offset to the right and { HEAD ~ the crowns } of the two lower pulleys are offset to { TAIL ~ the left }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL