{TAIL ~ Small grooves} 22 and 23 respectively are formed in {HEAD ~ the inner surface} of 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 
{ TAIL ~ Small grooves } 22 and 23 respectively are formed in { HEAD ~ the inner surface } of 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
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH