Often times the links and the keeper arms had to be soldered to {HEAD ~ the pivot bar} to prevent {TAIL ~ movement} therebetween 
to prevent
Often times the links and the keeper arms had to be soldered to { HEAD ~ the pivot bar } to prevent { TAIL ~ movement } therebetween
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH