This arcane knowledge is reserved for the elite brotherhood of wizards who have passed CS 101.
Personally I despise elitism and bigotry in all their myriad forms, and there is a big difference between being incapable of passing CS 101, and not having had the chance to take CS 101, due to getting lost on ones way to university because of stupid naive mistakes made in youth.
Meh, I bought this keyboard back in the nineties, used, on eBay, back when it was possible to use eBay without using a credit card or PayPal. It's a model M. They last a long time. I could take it apart and clean it, but so far I've never bothered. Maybe someday if I get incredibly bored I will. Meanwhile, if a key starts giving me trouble, I just take a half-unbent paperclip or something and fish a few cubic inches of matted hair and whatnot out from under that key, and then it works again. Problem solved.