• Above all take time. Soak plentifully in WD40, or the releaser of your choice, from both above and below. Keep spraying in at intervals over a couple of days if you can. Then a piece of wood over the top of the stem and a large hammer and really hit hard and with vengence - after all this thing is giving you alot of trouble.
    It depends to some extent on the mix of metals involved. If the stem and steerer tube are both steel then they are just rusted together which the WD40 should dissolve. If one or both are aluminium then galling may have occured which heat may be needed and subsequent cooling to break the bonds.
    Cutting the stem off is the last thing to do as although it releases the fork you are now stuck with a bit of metal in the steerer tube which could be a nightmare to get out plus you have destroyed the stem.
    This advise applies to the old 1"" steerer tubes and quill stems. Aheadsets I have no idea !
    Let us know how you get on.

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