WHILE HOISTING THE RIGGING OUT OF THE SHOVEL HOUSE, A CLEVIS ATTACHED TO THE END OF THE SLING CAUGHT ON A BEAM ENOUGH TO ""WHIP"" THE SLING AND THE CLEVIS STRUCK EE ON THE LEFT EYE OF THE SAFETY GLASSES. THE IMPACT CAUSED THE GLASSES TO CUT THE SKIN ABOVE THE EYE. 4 STITCHES WERE REQUIRED.