Well, generally you're right.
But as a the tool for tightening the brakes on Linde we use simple M10 bolt (hard material, 12 or more) with nut and big washers).
Works very well.
You may buy the necessary components everywhere and the cost is less than 15 $. Each of my technicians uses it succesfully.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.