May I ask what exactly this means:
I wold like to make a High Expectations Asian Father / Yo Dawg Inception meme about this, however, I do not own any of Oskar's Treasure puzzles.
I tried to find out via Google but I was not really enlightened.
I edited my first post:
EDIT: I assume you mean by `last layer` the white layer (the lid), right?
I made these photos anyway (click onto the thumbnails to get the original resolution):
...P.S. Approximately, what is the radius of the core?
I measured the width of the hole as 45 mm.