Crank pilot concentricity

If u actually believe the mass produced machining was spot on back in the earlier days ur living in a dream world. Back then maybe 1 or 2 out of a thousand may have been checked. And if they were checked do u think they were corrections made to the tooling? Now a days most anything can be checked at home, but how many actually do that? Not many unless there is a problem. U less ur gonna measure every last thing and correct it, don’t worry be happy. My nephew always tells me: don’t check it cause u don’t really want to know. This is on used stuff. New stuff I always check. Personally I have never just thrown stuff together and hoped for the best. Kim.