{HEAD ~ A slide bar} passes through {TAIL ~ the doorway} and is pivoted at one end to a movable end of the upper arm , and at the other end to a fixed bracket on the other side of the doorway  
passes through
{ HEAD ~ A slide bar } passes through { TAIL ~ the doorway } and is pivoted at one end to a movable end of the upper arm , and at the other end to a fixed bracket on the other side of the doorway
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH