 at least certain of said adapter blocks have a length dimension equal to {HEAD ~ the distance} between {TAIL ~ hub axes} of two connector elements when joined by a rod element having a length Lx, where “x” is a whole number from 1 to n 
between
at least certain of said adapter blocks have a length dimension equal to { HEAD ~ the distance } between { TAIL ~ hub axes } of two connector elements when joined by a rod element having a length Lx , where “ x ” is a whole number from 1 to n
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH