The arrow shown in the picture to the left points to one of the two pieces that are not mirror-paired.
Looking from the top, the back piece is removed \/
Back piece just removed
Slide the front section towards you and remove the front piece (same as the back piece previously removed)\/
Remove the piece that was behind the front piece \/
The end where the arrow is shown is the top -- as viewed from the top, with the notch pointing towards the center .
Remove the top center piece out from the top, exposing more of the center's structure
These two pieces come out from the bottom
<<< The top piece here is the center piece underneath the core .
<<< The bottom piece is the mirror image of the second of the two starting pieces .