WHILE FITTING SUPPORT LEGS TO SAMPLER, EE WAS STEADYING A PIECE OF SQUARE STEEL TUBING TO BE TACKED INTO POSITION. WHILE RIGGING THE SAMPLER INTO FINAL POSITION, IT SHIFTED APPROX. 6 INCHES. EE LOST CONTROL OF THE TUBE (WHICH WAS STANDING ON THE FLOOR). THE TUBE TOPPLED OVER AND STRUCK EE ON THE FOOT. NOT THE RESULT OF REG. NONCOMPLIANCE, NOT TRAINING/SKILL RELATED...