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