Small grooves 22 and 23 respectively are formed in {HEAD ~ the inner surface} of {TAIL ~ the disc} 20, and small grooves 24 and 25 are formed in the outer surface of the flange 19 and the lower surface of the thrust support 21, respectively 
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Small grooves 22 and 23 respectively are formed in { HEAD ~ the inner surface } of { TAIL ~ the disc } 20 , and small grooves 24 and 25 are formed in the outer surface of the flange 19 and the lower surface of the thrust support 21 , respectively
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH