Replace cracked case

My case is cracked. I have ordered and received a new one.
At disassembling the old case I have problems to disassemble the base reducer. (point2.5) in the tutorial.
I removed the four screws beside the magnet, but I can’t take the magnet out. It feels like it is still connected to something. Is there someone who can give me a clue?afbeelding
Kind regards, Harry

I just found the four tiny screws near the magnet. I thought I had to remove four screws in total, but it are eight screws,
four tiny ones and four bigger ones.
So the case is replaced and it is OK now