An externally threaded retaining nut 18 is screwed on a downstream threaded part 19 of the cylindrical portion 12 of {HEAD ~ the inner face} 6 of the first shaft 1 and comprises {TAIL ~ a collar} 20 which, on tightening, bears on a radial face 21 of the first shaft between the cylindrical portions 12 and 13 
An externally threaded retaining nut 18 is screwed on a downstream threaded part 19 of the cylindrical portion 12 of { HEAD ~ the inner face } 6 of the first shaft 1 and comprises { TAIL ~ a collar } 20 which , on tightening , bears on a radial face 21 of the first shaft between the cylindrical portions 12 and 13
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 TAIL 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 OTH OTH OTH