HE WAS ROTATING THE PIN MIXER BY HAND IN ORDER TO FINISH CLEANING OUT AFTER IT PLUGGED UP. IT ROTATED TOO FAR PINCHING HIS HAND BETWEEN THE ACCESS DOOR AND THE PIN HIS HAND WAS ON. EDGE OF PIN CUT PALM OF LEFT HAND ABOUT 1 1/4"" LONG AND DEEPENOUGH TO REQUIRE 3 SUTURES.