The Bell & Howell motion picture camera is and always was considered the steadiest camera movement ever made. All Bell & Howell 2709 cameras press each frame of film on to two fixed pilot pins . Because these two pins are fixed and don't reciprocate in any mechanical way they are not prone to mechanical wear. The Bell and Howell engineers made perfectly registered images by placing one pin on the right side and one pin on the left side of each frame as it is exposed. One pin holds the film steady top to bottom and the other holds the film steady right to left.