And now for a bolt puzzle! This is the Nut and Bolt puzzle from Eureka:
There are quite a few bolt puzzles out there, and even though they all look very similar the mechanisms on them do vary quite a bit. This puzzle bolt implements one of the classic mechanisms for this type of puzzle, and odds are it won't take you long to figure it out. The objective (as you have most likely guessed) is to remove the warped washer from the bolt, even though this seems physically impossible.
The quality of the puzzle is pretty good and the metal is solid. For the price you pay it is definitely worth getting, just remember that it is mass produced, so don't expect anything like the handmade quality you will get from designers like Rocky Chiaro for example.
I think this took me all of about 10 seconds to solve, but it wasn't properly assembled on arrival and that definitely contributed (although I would like to take all of the credit).
Go and buy one, you won't be disappointed for the price.
I got hold of this puzzle from: Puzzle This (again)
It's starting to look a bit like I'm promoting for Puzzle This doesn't it? I'm not....they're just a great company to deal with, plus they're in the UK.