to connect the bands 14 to the lugs 24 of the fixed anchor piece 20 the bands 14 and movable anchor piece 34 are then moved back toward the second end cap 18 until the first end cap 16 interlocks with the body shell 12 as explained above the second end cap 18 is then interlocked with the opposite end of the body shell 12 to close the column 10 at this point the bands 14 are only losely held next the tensioning member 42 is inserted through the aperture 48 of the second end cap 18 so that the shank 42 engages the threads of the movable end anchor 34 at this stage in the assembly of the column 10 the tensioning member 42 carries a break away drive piece 54 that along with the head 46 to which it is attached passes through the center of the cross shaped opening 32 of the second end cap 18 the drive piece 54 hexagonal in this example is engaged by a suitable tool to rotate the tensioning member 42 rotation in the proper direction causes the movable anchor 34 to be pulled toward the second end cap 18 in this manner the bands 14 are stretched between the two anchors 20 and 34 after a predetermined tension has been applied to the bands 14 the drive piece 54 breaks off and can be extracted from the second end piece 18 through the cross shaped opening 32 the serrations 52 do not interfere with rotation of the tensioning member 42 in the direction that increases the tension on the bands 14 they.