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Kimmo
Yes you definitely want to use a metal hammer on a headset tool. Just hit it harder, as long as the tines (can you call them that?) are secure on the cups you should be good. You could give it a good soak in some wd40 or specific release penetrant overnight and then try again the next day.
Try and secure the frame and the area around the head tube as best you can so that as much force from the hammer is going into forcing the headset out and not just bouncing the frame around.