I've only made it half way through the second one as yet and so far all I'm hearing is dunn droning on about stuff totally outside his experience along with that other machinist and trading straw man assumptions with childress, who has no experience at all and can't even pronounce basalt right.
I've known a 14 year machinist that couldn't use hand tools to save his life. Expertise in one area doesn't infer expertise in the other. The end results are similar yet the methods are different. If I were looking to gain insight into a hand tooled work I wouldn't ask a machinist, that's for sure.