Nuts threadedly engage the posts to engage {HEAD ~ the conductive bar} securely to {TAIL ~ the posts} 
Nuts threadedly engage the posts to engage { HEAD ~ the conductive bar } securely to { TAIL ~ the posts }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL