flip it upside down (forks in the air) and wd40 the inside, leave it to soak, clamp the frame and use a pole that fits inside the steerer push it in and on to the bottom of the stem and smash it back out.
@Greasy_Slag started
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flip it upside down (forks in the air) and wd40 the inside, leave it to soak, clamp the frame and use a pole that fits inside the steerer push it in and on to the bottom of the stem and smash it back out.