In the illustration of FIG 1, the adapter blocks are arranged for compatibility with {HEAD ~ rod and connector subassemblies} incorporating {TAIL ~ a specific size} of rod 
In the illustration of FIG 1 , the adapter blocks are arranged for compatibility with { HEAD ~ rod and connector subassemblies } incorporating { TAIL ~ a specific size } of rod
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH