rod 160 is then passed through column segment 162 at the lower through hole not shown and upper through hole 122 the bottom of column segment 162 rests on the arena floor while the top of column segment 162 receives or matingly engages with column segment 164 by this we mean that the upper protrusion of column segment 162 is arranged to receive the lower protrusion of column segment 164 in particular locating slots 124 raised segments 116 and domed recess 133 not shown are arranged to receive projections 130 spacers 132 and domed portion 118 respectively inner partially weakened groove 126 is removed to allow installation of mounting plate 166 mounting plate 166 rests on inner shoulder 144 described supra mounting plate 166 includes a central through hole which is arranged to receive mounting rod 160 when column segment 164 is located atop column segment 162 and on mounting rod 160 once mounting rod 160 passes through mounting plate 166 washer 168 and nut 170 are removeably secured to mounting rod 160 when nut 170 is secured to mounting rod 160 both of the column segments are held by tension between mounting plate 166 and the arena floor the preceding example is for illustrative purposes only as it should be apparent to one or ordinary skill in the art that multiple column segments could be stacked atop one another so long as the final column segment includes mounting plate 166 and mounting nut 170 thus in.