The special effects were simple and limited by the budget. The on-screen blood was real in some cases, such as the scene in which Leatherface feeds "Grandpa". The crew had difficulty getting the stage blood to come out of its tube, so instead Burns's index finger was cut with a razor. Burns's costume was so drenched with stage blood that it was "virtually solid" by the last day of shooting. The scene in which Leatherface decapitates Kirk with a chainsaw worried actor William Vail (Kirk). After telling Vail to stay still lest he really be killed, Hansen brought the running chainsaw to within 3 inches (8 cm) of Vail's face. A real hammer was used for the climactic scene at the end, with some takes also featuring a mock-up. However, the actor playing Grandpa was aiming for the floor rather than his victim's head. Still, the shoot was somewhat dangerous, with Hooper noting at the wrap party that all cast members had obtained some level of injury. He stated that "everyone hated me by the end of the production" and that "it just took years for them to kind of cool off. "