INJURED STATES HE WAS NAILING STRONG BACK (SMALL PIECES OF 2 X 4 LUMBER) ONTO THE FACE OF CEMENT FORMS. WHEN HE SWUNG HIS HAMMER TO HIT A NAIL, THE HAMMER STRUCK AND GLANCED OFF A TURN BUCKLE, CAUSING THE HAMMER TO STRIKE HIM ON THE END OF HIS LEFT LITTLE FINGER.