A lock nut is screwed onto the outer end of the bolt and is locked to the nut, so that rotation of the lock nut rotates the bolt and adjusts {HEAD ~ the circumferential position} of {TAIL ~ the locking bar} 
A lock nut is screwed onto the outer end of the bolt and is locked to the nut , so that rotation of the lock nut rotates the bolt and adjusts { HEAD ~ the circumferential position } of { TAIL ~ the locking bar }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL