Not a micrometer nor vernier in sight, just basic callipers, ruler, and a scrap of paper with dimensions given in "fractions". Incredible what these guys can do with antiquated drop hammers, lathes, and drills, all without coolant or cutting oil.I'm from America,I have worn many hats in my life, machinist,welder,auto mechanic, plastics blow molding technician, electrical, plumbing and other construction techniques,I must say what these men accomplish with the tools they have at hand and sometimes just good old psychical labor is amazing to watch!!