There is no science behind the claims in this article (and the book).
Not that this'll stop people from buying into the false narrative and buying the book.
Showing my age here, but I remember waiting with my friend for "Blame it on the Rain" to play on the radio so I could tape it.
While I can't speak for your rack in particular, most pre threaded racks are either 10-32 or 10-24 screws.
You can buy them easily on Amazon.
I work in television, and in our equipment room we have 50 racks that are pre threaded. And we use these: [Amazon link](Penn Elcom S1032/HP/WA/100 High Point Rack Screws with Washers - Set of 100 https://a.co/d/g13kPzw)
What printers are you trying to sell?
Upvote for a CarTalk reference, nice.
Me fail English, that's unpossable.