OK, this is a long one of mine, might be a bit tl;dr
Roval Control wheelset with bad hub bearings. Got myself the DT240 hub tool, first time I’ve had to do it, let’s go. Get NDS end cap off. Can’t get DS end cap off. Can’t get freehub off either. Lightweight wheel makes terrifying noises when I try to pull it off.
The mistake- I know, I’ll just tap it all out from the non-driveside, easy. DT owners will know, you can’t do this, the axle can only go out the NDS because of the ring ratchet.
So, give it a tap. Nope. Give it a harder tap, hmm. This is really seized! Bigger hammer. And at no point stopping to think for even a second why it wasn’t working. Ended up splitting the axle and bending the freehub body. Spat the dummy, went into the house.
Next day, realised what I’d done wrong, tapped out the DS endcap in about 2 seconds by sticking a bar through the axle, then had the rest of the hub in bits 10 seconds later. Amazing thing, the human brain, eh.