"Most of the work was done by hand..." Well, the machines and jigs to make them were quite sophisticated. From the video: "You'll notice that at no time are t

"Most of the work was done by hand..." Well, the machines and jigs to make them were quite sophisticated. From the video: "You'll notice that at no time are they touched by hand." Start at about 12:05: https://www.youtube.com/watch?v=GDvF89Bh27Y&t=12m05s https://www.youtube.com/watch?v=GDvF89Bh27Y&t=12m05s