11. The assembly of claim 8 , further comprising the upper compression structure including: a) the upwardly projecting structure is a pin that extends upwardly and is sized and shaped to engage the inner fastener lower through-bore; and b) a pair of downwardly extending leg portions joined by a lower U-shaped surface so as to be adapted to engage and partially encircle the connecting member.
11. The assembly of claim 8 , further comprising the upper compression structure including: a) the upwardly projecting structure is a pin that extends upwardly and is sized and shaped to engage the inner fastener lower through-bore; and b) a pair of downwardly extending leg portions joined by a lower U-shaped surface so as to be adapted to engage and partially encircle the connecting member. 16. The assembly of claim 11 , wherein the U-shaped surface is adapted for substantial non-compression of the longitudinal connecting member assembly.