Thanks for all the help here. I have replaced pads, which went fine, bled brakes. But the pads are still rubbing on the disc. The brakes not on, the wheel moves easily enough.
I've tried fiddling around with the push rod. I think the problem is that I haven't been able to unscrew it far away enough from the cylinder. Every time I try it feels like it the male bolt is going to come away from the female part. Maybe the disc has a wobble in it?
Anyway, I'm going to take it to a workshop and get an expert to have a look at it. Despite the lack of success here, it is my opinion that it is always better to have a go at things yourself before taking it to the shop, at least you learn more about the bike that way. I haven't made it worse than it already is, and I think I would have to be extremely unlucky to totally f*l things up.
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