Rubik's Cube and More

Put-Together and Take-Apart Puzzles

Disassembly

It seems to be impossible to open, unlock or take apart these puzzles, but there is a trick.

Nut & Bolt Puzzle or Trick Bolt [birthday present 2002]
The aim is to get the nut off. The thing is: It can only be screwed in one direction (the wrong one).

Duallock Cross by Bartl [flea market, for free, June 2008]
The aim is to seperate the two pieces. The mechanism is the same as of the Sesame Piggy Bank.
The seller challenged his customers: Whoever would solve this puzzle would get it for free.
The name is not orininally by Bartl.