A spiral wrap portion 6 is provided on the end plate 5 so as to project axially from {HEAD ~ the surface} of {TAIL ~ the end plate} 5 
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A spiral wrap portion 6 is provided on the end plate 5 so as to project axially from { HEAD ~ the surface } of { TAIL ~ the end plate } 5
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH