I worked with a guy who lived in Detroit and worked for GM in the 1970s. He was on the assembly line and at times they would have him fill in on other jobs. He told me they sent him to do leading on roof seams, something he never did before. He did it for an eight hour shift. The guys in finishing and body work complained that he was putting too much lead on, and it was taking them too long to grind it all down. I wonder how many cars that day were made with a guy who had no idea what he was doing. These factories would just have you fill in when someone called in sick, etc. I know someone who bought a 1972 Duster 340 brand new. Many years later he went to have the car repainted and discovered the side stripe must have been damaged at the factory. Their answer for repair? They put another stripe right over the old one!