P.s. This was not my idea credit goes to This Site . However the pictures are my own.
Step 1: Materials and tools
A left-handed bolt (For size, look at the picture) and matching nut.
(By the way you can also use a right-handed bolt if you don't have any left-handed bolts, I have used a right-handed bolt and not had any one guess it thus far. However the puzzle will no doubt work better with a left-handed bolt.)
A split washer (Notice that I split it more, see picture).
A file for metal.
A saw for metal.
Drill with wire brush attachment.
Step 2: Step 1
Note: These notches do nothing, But most people will think they are the key to solving the puzzle.