From today's NYT article:

But when Apple began making the $3,000 computer in Austin, Tex., it struggled to find enough screws... In China, Apple relied on factories that can produce vast quantities of custom screws on short notice. In Texas, where they say everything is bigger, it turned out the screw suppliers were not.

After creating months of delay, Apple ended up ordering the screws from China. Eventually, Apple found a supplier in Texas that could produce 28,000 custom screws, although they weren’t the exact screws needed nor in the right quantity, according to the NYT. And they were delivered over 22 trips, often in a Lexus driven by the maker’s owner.

https://www.nytimes.com/2019/01/28/technology/iphones-apple-...