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