TWO MECHANICS WERE CHANGING A BROKEN AXLE ON A LHD, REQUIRING ONE MECHANIC TO LAY UNDERNEATH THE LHD WITH AN IMPACT WRENCH WHILE THE OTHER MECHANIC USED A WRENCH ABOUT 2-3' ABOVE HIM. THE TOP WRENCH FELL AND HIT THE EE IN THE FOREHEAD,RESULTING IN 2 STITCHES TO CLOSE THE WOUND.