FIGS 4 and 5 are sectional views of the stem 8 showing {TAIL ~ groove} 41 for engaging {HEAD ~ a spring clip} and slanted surface 42 
FIGS 4 and 5 are sectional views of the stem 8 showing { TAIL ~ groove } 41 for engaging { HEAD ~ a spring clip } and slanted surface 42
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH