the round like profile presented by the teeth 42 and 64 can if not already touchingly positioned impinge the outwardly located ends of the corresponding segmented arcuate portions 80 a and 80 n to maneuver the teeth 42 and 64 into close mutual proximity or even into intimate contact to provide a minimum profile so that passage of the teeth 42 and 64 into the slot 86 a can be readily and easily accomplished the body hole 70 in the left jaw 24 is sized to allow sufficient rotation of the left jaw 24 about the mounting rod 12 without interference of the threaded shaft 50 fig6 illustrates a top view of the final step of fastening the clamp assembly 10 and the mounting rod 12 to the host structure extruded geometrically configured tube 14 the actuating knob 28 is turned to reposition the left jaw 24 and the right jaw 26 in opposition about the mounting rod 12 which acts as a pivot and as a fulcrum the actuating knob 28 is brought to bear against the exterior planar surface 62 of the left jaw 24 thus imparting a counterclockwise movement of the left jaw 24 about the mounting rod 12 thereby positioning the groove 68 against one end of the segmented arcuate portion 80 n of the extruded geometrically configured tube 14 at the same time the rotation of the threaded shaft 50 repositions the right jaw 26 in a clockwise direction about the mounting rod 12 thereby positioning the groove 46.