As shown in FIG 3, the center of the wrap portion 6 is a spiral starting end 6A, and {HEAD ~ the outer peripheral end} of the wrap portion 6 is {TAIL ~ a spiral terminating end} 
is
As shown in FIG 3 , the center of the wrap portion 6 is a spiral starting end 6A , and { HEAD ~ the outer peripheral end } of the wrap portion 6 is { TAIL ~ a spiral terminating end }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL