Gary S,
I am from that group of American slide rule pushers of the 70's, and if I recall, our men and women did know precision. Landing men on the moon and returning them safely was our thing.
Building garden tractors that last and last over 40 years of actual service, not thrown to the curb, our thing too.
If you believe our tolerences were off, you should try to attach equipment on one of "today's finest" garden tractors where bearings gave way to bushings etc. Often installing a snowthrower drive system requires more time and tools then it did 25 years ago, not to mention the "new" use of belts driving everything, including hydrostatics that are designed with a 300-400 hour life span to match the engine and frame. (If that, some mfrs consider 30 hrs/yr to be typical of today's user and build for a 120 hour life span, that is all, and yes, it is sad but very true). I know this to be fact as I have spent much of my life in this industry.
Take a country drive, see all the old Farmall M's and old Olivers etc still working daily on farms? Compare that to all the European/Asian tractors parked as junk, like the Belarus and Leyland tractors, we American manufacturers were doing just fine until the global influence brought planned obsolesence into being.
Sorry, just had to vent....
BTW, I include our Canadian counterparts in my statement as we have a great history of joint development and manufacturing excellence!