a post having a web and a front and rear flanges disposed fixedly on said web;

a front lip disposed fixedly on a lower surface of said front flange distal from said web;

a front fastening plate having a front camming end disposed insertably between said front and rear flanges and a front pierced end, said front camming end comprising further:

a front abutment surface substantially orthogonal to said front fastening plate and abutting said web;

a front finger surface disposed insertably between said front lip and said web and abutably to said front flange;

a front complementary surface disposed substantially parallel to said front fastening plate; and

a planar front camming surface disposed at a first predetermined angle to said front abutment surface and said front complementary surface;

a rear lip disposed fixedly on an upper surface of said rear flange substantially opposite said front lip and distal from said web;

a rear fastening plate having a rear camming end disposed insertably between said front complementary surface and said rear flange and a rear pierced end, said rear camming end comprising further:

a rear abutment surface substantially orthogonal to said rear fastening plate and abutting said web;

a rear finger surface disposed insertably between said rear lip and said web and abutably to said rear flange;

a rear complementary surface disposed substantially parallel to said rear fastening plate and abutably to said front complementary surface; and

a planar rear camming surface disposed at a second predetermined angle to said rear abutment surface and said rear complementary surface;

wherein said planar front camming surface is disposed abutably against said planar rear camming surface while said front and rear pierced ends are separated to insert said front and rear camming end between said front and rear flanges.