I don't have the book, but find the process of machining very interesting.
Some of the highest level skills in the world after the industrial revolution were cultivated by the machinists. My grandfather worked as a machinist making commercial sewing machines in the 1910-1940 period. I'm confident that they used the same techniques as the German plants. There was no numerical control so repetitive tasks holding standards relied on skill.
This area of the frame appears to be one of the less critical, so it looks like more variance is present and visible.
Until I can get access to Gibson's book, it would be interesting to know an overview of the processes in the different plants, and if the later holders of the manufacturing equipment followed the same processes as the original companies.
Marc
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