Having done a fair amount of design, frankly 'the correct engineering
solution' is a load of twaddle. 99.7% of engineering is 'good enough' -
not 'exactly right'
There is a huge pressure to reduce stock inventory as well. which is why
having a special screw that is M 5.638 or somesuch might just happen in
a space mission, but nowhere else not even a Merlin engine.
3BA wasn't that common, but it was a standard.
Most cars do NOT use a zillion different bolts either. probably no more
than half a dozen in any given car..however the next manufacturer whose
car you fix, has a completely different half dozen. His inventory is
If you tell a lie big enough and keep repeating it, people will
eventually come to believe it. The lie can be maintained only for such
A recent version of the MotoGP works Ducati motorcycle was *designed*
with every bolt size imaginable. It caused all kinds of problems as the
mechanics had to have all sizes of spanners to hand when they worked on
the bike and it's very difficult to spot the difference between similar
sizes. Making changes during setup of the bikes during practice took
twice as long as necessary. There was no "correct engineering
solution" shown by the designers whatever.
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