said retaining nut comprises a cylindrical projection extending upstream at the inner edge of said upstream face of said nut for cooperating with said inwardly facing surface of each of said fly weights, an annular groove in said upstream face of said nut between said cylindrical projection and said conical surface thereof, said groove housing a spring adapted to act axially between said nut and said fly weights, and a collar at the downstream side of said nut cooperating with {HEAD ~ said radial face} of {TAIL ~ said first shaft} 
said retaining nut comprises a cylindrical projection extending upstream at the inner edge of said upstream face of said nut for cooperating with said inwardly facing surface of each of said fly weights , an annular groove in said upstream face of said nut between said cylindrical projection and said conical surface thereof , said groove housing a spring adapted to act axially between said nut and said fly weights , and a collar at the downstream side of said nut cooperating with { HEAD ~ said radial face } of { TAIL ~ said first shaft }
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