A connector element may be attached in the usual manner to {HEAD ~ an adapter rod} projecting from {TAIL ~ a block element} 
projecting from
A connector element may be attached in the usual manner to { HEAD ~ an adapter rod } projecting from { TAIL ~ a block element }
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 TAIL TAIL