This was very interesting. I’ve never seen the last type of lock washer before. It would have been nice if they would have included some of the various thread locking liquids as well.
as a retired ASE master tech I liked the Loctite brand thread locker the best, the RED if you want a non easily removable bolt or nut. you sometimes have to heat with a torch to get the loctite to soften up to remove without breaking,the blue is a medium strength that does not require heat to soften up to remove the bolt or nut, on small bolts like #6-8-10 or 1/4 & 5/16 I prefer the star washers