Hip-Flask Puzzle - Sequential Metal Puzzle

Nice heavyweight puzzle! One flaw (without betraying the solution) is that a tiny pin can fall out and I very hard t replace (requires tweezers).

Several months ago, I watched Chris Ramsay solve this puzzle. Despite seeing how it was solved, I was still very puzzled about the solution. The design is genius, and the result is satisfying when it's solved.

Personally, this is my favorite puzzle from Felix Ure (I also have the Titan Puzzle and the Piston puzzle). Took me a while to solve but once you have figured out the inner workings it is still a challenge. This puzzle requires a little more understanding of how the mechanism works. Very interesting puzzle.