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