{HEAD ~ A nut} is threaded onto the outer end of the bolt and contacts the sleeve, so that rotation of the nut moves the sleeve axially of the bolt to adjust the pressure of the spring on {TAIL ~ the locking bar} 
{ HEAD ~ A nut } is threaded onto the outer end of the bolt and contacts the sleeve , so that rotation of the nut moves the sleeve axially of the bolt to adjust the pressure of the spring on { TAIL ~ the locking bar }
HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL