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!!Sixty five years ago I served my time in a machine shop with ex W D lathes, shapers, milling machines etc. Manual chain hoists over the machines.. Steel rules, calipers and micrometers borrowed. Engineers blue and a scraper for lapping in. Like these guys we got the job done. Happy days and hard work.