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