I have a wooden puzzle which you can only get apart by spinning it. It has an internal channel which contains two brass inserts. If you spin the puzzle the bras

I have a wooden puzzle which you can only get apart by spinning it. It has an internal channel which contains two brass inserts. If you spin the puzzle the brass inserts fly to the ends of the channel and no longer lock the puzzle. Shaking the puzzle or turning it upside down inevitably causes one of the brass inserts to lock the mechanism. It is a good ah ha moment when you figure out that spinning the puzzle unlocks it. The puzzle in the article works in a completely different way and looks like it is more secure to random fiddling. It looks very attractive too. I'd certainly add it to my puzzle collection if I could :-)