How to solve the Hanayama Cast Nutcase metal puzzle

Check out this video tutorial on how to solve the Hanayama Cast Nutcase metal puzzle. These cast iron Hanayama puzzles are a great way to kill time and sharpen your mind, and this Cast Nutcase puzzle will do that with a level 6 out of 6 in difficulty. See how to disassemble and reassemble it.

From Hanayama himself: There are two goals to the Cast Nutcase created by the Dutch puzzle inventor, Oskar:
1. Remove the small nut by disassembling the cast nutcase.
2. Cast puzzle enthusiasts (nutcases) can enjoy trying to change the wording on the bolt from 'nut-case' to 'case-nut'.
The key word is "Interlocking."