Two maintenance technicians were changing out drive belts on the south end of the vulcanizing vessel. To check the proper function of the drive belts, the technicians manually cycled the cars into and then out of the vessel. One technician was manually cycling the vessel back out and the injured technician was inspecting the belts and checking the tension. The injured technician's right index finger was pinched between the belt and the pulley, resulting in an amputation of the distal phalanx.