Hanayama Cast Puzzle - U & U - Level 4 battery One of the protruding sides

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Hanayama Cast Puzzle - U & U - Level 4 battery One of the protruding sidesU & U Cast Puzzle Level 4 Two U shaped bolts and four nuts this looks like a combination of spare parts but looks are deceiving. This puzzle comes with a deviously hidden trick. The key to unlocking these parts is to look carefully at each part first. It was designed by Kyoo Wong from Hong Kong. The theme is complexity. Hanayama is known worldwide for challenging puzzles and quality manufacturing. Can you take the pieces apart, then put them back