mis welded bodies
In the old days the all the locating pins and clamps were manually closed. If a panel did not fit the welder was supposed to align it with a drift pin then close the locator and lock it in,
once a body was painted they usually did not scrap it. In the Factory we had a large wet belt sander that they used to sand a windshield to fit , Until electric sensors were added to verify the Buck sometimes I would see one or two bad bodies a month out of an 8000 lot build. and there was a 59 Ford sedan that made it to the final inspection, drive away area that was a 2 door body on one side and a 4 door body on the passenger side. The rumor followed it down the assembly line that it was a safety Taxi cab so the rider could not get out on the traffic side. In the 80's when fox body Mustangs and Capries were built, a limit switch stuck and a mustang on one side and a capri on the other side. The Plc program did not have a go- no- go verify loop logic reset check. and the Ford design engineer that rewrote the program became an expert witness when amusment park accidents happened because there was not enough safety logic in their operating programs.