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