Remove the brass washer. Just remove the brass washer from the steel bolt.
A Bolt from the Blue was Ali's exchange puzzle at the Edward Hordern Puzzle Exchange in August 2023 at the 40th International Puzzle Party.
This puzzle is made from a modified heavy, steel bolt and comes in a specially 3D printed case with a lovely (if we do say so ourselves) vinyl label. It stands about 9.5cm / 3.5 inches tall in it's case.
For a little more information on the International Puzzle Party there is a nice article here