A spring is supported by {HEAD ~ the bolt} and urges the sleeve and {TAIL ~ locking bar} toward the outer end of the bolt 
A spring is supported by { HEAD ~ the bolt } and urges the sleeve and { TAIL ~ locking bar } toward the outer end of the bolt
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH