You could try heat again and then spray WD40 gingerly on it to cool it and that "can" draw some of the oil into the pin. BE ADVISED that WD40 is FLAMMABLE. Have a hose or fire extinguisher handy. Sometimes these things need any and all persuasion you can throw at it.
you could also try heat on the outside area of where the pin goes in and then try and sprinkle a bit of water on the pin itself to keep it cooler as the outer area expands. This is a small area you are trying to get at and this may not be practical but give it a shot.
Good luck
