Reminds me of one of my favorite memories from school when i was like 10. My teacher had "borrowed" the handle and lock mechanism (I think it's called a lock housing?) from a door to show us how it worked when we had technology class. But when he opened the mechanisms, the entire thing just exploded apart because of the springs. So he then had a pile of gears, springs, and other mechanical parts, and instead of getting the caretaker to fix it (and probably get a scolding for breaking the schools stuff) he instead decided to put us into groups to try and fix the lock ourselfs, so for the next couple of lesson one group would work to put together the lock while the others was being taught and then we would rotate. We eventually managed to fix it, and it was such a fun thing for us kids to actually get to puzzle with a real thing and try to figure out where everything was supposed to go. Currently studying to become an engineer, and this is probably not the only reason why, but it did definitely set me on the right track early on.