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