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