EE HAD DRILLED A HOLE IN THE ROOF USING 2 SECTIONS OF DRILL STEEL. WHEN HE LET THE PRESSURE OFF, THE TOP STEEL STAYED IN THE HOLE AND THE BOTTOM STEEL FELL. WHEN HE WENT TO GRAB THE BOTTOM STE EL, THE OP ON CAME DOWN STRIKING HIM ON RT HAND AGAINST DRILL POT. EE DID NOT MISS WORK UNTIL 11-13-03.