Have to add a comment from a flight engineer who came from an Asian airline. He said he was in the simulator of a Classic one day and the instructor had a bamboo cane which he would use to rap the F/O over the knuckles when he made a mistake. After a short time he reached round, took the bamboo cane out of the Checkers hands and folded it into several pieces, with the words, "I think we are going to get on much better without this."
F/Es were more than a third set of eyes...