Abstract: On December 17, 1997, Employee #1, the production manager for an aircraft parts manufacturer, was walking through the plant when he observed a coworker trying to loosen one of the bolts holding together a stretch form die for a press. He offered to hold the 3/4 in. combination wrench that the coworker was using to hold the nut of the fastener. As he held the wrench with his right hand, the coworker torqued the bolt head with a ratchet wrench. When the fastener loosened, the torque being applied by Employee #1 turned into momentum and the wrench and his hand rotated around until his thumb became wedged between the wrench and a 1/2 in. plate secured to the face of the die. The tip of his right thumb was amputated.