I replied earlier but don't see it now, so excuse me if both show up.
I got mine out by tapping with a rubber mallet around the perimeter of the black piece with the body of the furler in a vise. After it was "broken free" of the accumulated salt and crud it came out easily. You might try a solvent like PB Blaster, or just soak it in freshwater to dissolve the salt first. A combination of tapping and twisting (with a strap wrench) might be successful.