The trouble with engineers and draftsmen started circa 1946 in aviation . In 1945 if there was a place that had a hole to reach up into with both hands a box end wrench , torque wrench , pair of dykes , a nut bolt and 3 assemblies to attach there was a centered vision sight hole that actually let you see what needed to be seen . Like the end of the bolt and nut for the cotter key in the tail wheel strut of a North American AT-6-D . In 47' they had stuff with stuff boxed in so tight it takes 3 ground , bent , twisted starter wrenches to reach and you have to work on the left side from the right side . Just to keep things interesting and ensure it becomes a blood sport the design has the close tolerance steel lock nuts inside an over hang . You can see the nuts , you can put your finger on them , but you can't see or touch them after you get the wrench on them . See Beechctraft V-35 starter , generator or mags and Cherokee vacuum pumps aren't any better .
I figure what happened was an engineer came home and caught his Rosie with a mechanic that was good with his hands and it's been on every since .
It's always the same . $5 problem with a dime solution to save a $200 component that could have been cured in prototype and production for a nickle but it has to be done manually instead of automatically because of one shady lady 70 yr ago .