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