What Ia m saying is that non technical people should stick to non technical subjects . They confuse people as to the best approach to following good engineering practice . Thus like Trumpy misleading the innocent . I am an engineer but have also a lot of practical experience designing and working with gearboxes , combustion engines , gas turbines and various other mechanical disciplines . Thus I feel qualified to make a educated assessment of such matters . It really doesnt matter in he end . I sometimes wonder if people on these boards want technical advice , or if they just want to debate endlessly , with no technical background to the statements they make .