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