The point of my post was to simply show how the disassembly looks like on that lens and to warn what parts not to unscrew.
During that disassembly I accidentally misaligned the center elements and in general you can't get them back - have to send it into repair.
I also added some pictures with the front element put back on the lens the wrong way that created that center-focus-effect. I wasn't going for any effects in particular, simply played around and cleaned the interior of my lens.
Thanks for the mention!