THE TECHNICIAN WAS CHANGING THE SHIMS ON A SHOVEL. THE SHIM BAR SLIPPED ALLOWING THE LATCH BAR TO FALL WHICH PINNED BOTH OF HIS THUMBS. THE RIGHT THUMB WAS AVULSED AND FRACTURED. THE LEFT THUM B WAS DEEPLY CUT JUST BELOW THE TUMB NAIL AND ABOVE THE KNUCKLE. IT WAS RE-ATTACHED.