INJURED EMPLOYEE WAS INSTALLING A WALER CLAMP ONTO A CONCRETE FORM ASSEMBLY. AT THE SAME TIME, A COWORKER WAS ON THE OPPOSITE SIDE OF THE FORM USING A HAMMER TO DRIVE A PENCIL ROD THROUGH THE WALER. AS THE SHARP END OF THE PENCIL ROD CAME THROUGH THE WALER, IT STRUCK THE INJURED EM- PLOYEE'S HAND AS HE WAS INSTALLING THE CLAMP.