bottom of base 12 centrally located for example referring now to fig3 a perspective view of the wedge assembly of fig1 with a post 18 installed therein corresponding elements to the embodiment of fig1 are employed the placement of the side cover 86 when assembled is further illustrated in fig3 fig4 is a top view of the configuration of fig3 while fig5 is a sectional view taken along line 5 5 of fig4 the placement of one clevis pin 80 is illustrated by showing the pin in the foreground of fig5 insert 16 is suitably made of a urethane further details of the assembled wedge may be observed with reference to fig7 10 and 11 13 while the assembled wedge installed into the base 12 is shown in further examples in fig1 16 the operation of the embodiment of fig1 14 provides easier removal of the wedge portion by the use of the keyhole slots and clevis pins which fit therein and slid down to the desired position the bias of springs 60 urge engagement of the clevis pins against the body 12 but allow easier removal of the wedge if necessary adjustment of the wedge by rotation of actuating bolt 38 causes the wedge to expand or contract to tightly engage the post 12 accordingly the embodiments described herein provide a rigid yet removable engagement of a post which may.