On its downstream side, each fly weight 22 has {HEAD ~ a sloping face} 25 which cooperates with {TAIL ~ a forwardly divergent conical surface} 26 provided on the upstream side of the nut 18 
cooperates with
On its downstream side , each fly weight 22 has { HEAD ~ a sloping face } 25 which cooperates with { TAIL ~ a forwardly divergent conical surface } 26 provided on the upstream side of the nut 18
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH