An outer edge portion 7 is integrally formed with {TAIL ~ a radially outside portion} of the end plate 5 so as to surround {HEAD ~ the wrap portion} 6 
An outer edge portion 7 is integrally formed with { TAIL ~ a radially outside portion } of the end plate 5 so as to surround { HEAD ~ the wrap portion } 6
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH