I saw a show on “The History Channel” where a group was restoring a WWII Sherman.
One thing they did was rebuild the engine and also the clutch. They actually found a brand new in the box replacement clutch.
The thing which struck me is it took them several days to take the engine out. One of them commented that during WWII they routinely replaced engines in the field in two hours.
Our parents and grandparents were very capable people.
There is a slight difference in motivation between the two scenarios...
I don’t doubt that under the exigencies of combat and operations, coupled with the experience of doing dozens and dozens of them, along with having all the tools, parts and everything, that it could be done so much faster.
But, yes...our parents and grandparents were extremely capable people!