Between the outer ring 5 and the retaining nut 18 there are {HEAD ~ a plurality} of {TAIL ~ fly} weights 22, the upstream faces 23 of which cooperate with the downstream face 16 of the outer ring 5 
Between the outer ring 5 and the retaining nut 18 there are { HEAD ~ a plurality } of { TAIL ~ fly } weights 22 , the upstream faces 23 of which cooperate with the downstream face 16 of the outer ring 5
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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