part 4 is a clamp consisting of a rectangular bar long enough to reach across to the outer flats 26 of said rocker 3 said clamp 4 has two semicircular grooves 21 also proportioned to accept the said saddle rails 18 in the center of said clamp 4 is a female thread 20 which will accept the male threads 27 of a standard commercial high strength bolt 5 said threads may consist off a ferrous metal insert pressed or threaded into said clamp 4 in the alternative construction of the head of post 1 shown in fig8 the pin 25 is replaced by the two lugs 31 formed from the wall of the the 1 or attached thereto by a suitable means such as welding or brazing holes 9 in the lugs 31 are functionally the same as the holes 9 in the crosspin 25 in fig9 an embodyment is shown where the lugs 37 are formed by slistting and bending down a portion of the wall of post 1 in said lug 37 are the same holes 9 functionally the same as those in crosspin 25 the rocker 3 serves as the principle load transfer means between the saddle rails 18 and the top of the post.