Thanks, got it! I tried it before, but the pads were stuck harder than on my HD250, so I got unsure. I just had to try harder.
Now how do you remove the "headband-band"?
I mean the padded belt that rests on the head? Mine has started to disintegrate in the surface and looks quite ugly. I was thinking to either buy a complete headband for HD250 and take the padded belt from that, or make my own.