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