Correspondingly, between the projection 28 and the conical surface 26, the retaining nut 18 has {TAIL ~ an annular groove} 30 which houses {HEAD ~ a spring} 31 
Correspondingly , between the projection 28 and the conical surface 26 , the retaining nut 18 has { TAIL ~ an annular groove } 30 which houses { HEAD ~ a spring } 31
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH