First, the unitary, shielded, perforate threaded collars 42 are screwed onto {HEAD ~ the protruding threaded ends} 34 of {TAIL ~ the bolts} and tightened to jam the nuts 40 against loosening 
of
First , the unitary , shielded , perforate threaded collars 42 are screwed onto { HEAD ~ the protruding threaded ends } 34 of { TAIL ~ the bolts } and tightened to jam the nuts 40 against loosening
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH