I finally got around to replacing my disc pads (Shimano BR-RS805 hydraulics) and after changing the rear pads and confirming that they work for a week, I tried to do my front ones.
However, I could not get the retaining pad axle to unscrew at all. I squirted some WD40 on it (bad idea for brakes, I know) and left overnight and it is still completely seized. My flat-head screwdriver is just ripping the head apart rather than loosening it at all.
I've now ordered a replacement pad axle (hopefully the right one) and will wait for that to arrive before getting medieval on the original.
Anyone got any tips for drilling out the seized one?