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