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@Constable_Savage
in reply to @chrismcr Take the front wheel out and stand the bike upside-down. Then try repeated use of proper penetrating oil via the bottom of the steerer tube so that it is going straight on the bolt and recessed allen key. If you can find a torx bit that will just fit the allen socket wack that in with a tap of a hammer and then try to undo it with that. You might have to file the torx bit to get it to fit but it might just find enough purchase to move it. Use of an impact screwdriver is good if you can keep the fork adequately braced (laid on a sandbag maybe). If you can remove the bottom bracket too you could try penetrating oil down the seat tube from that direction too. The longer you can do it for the better the result. If you start getting oil appearing on the exposed seat post you'll know that it is working. Thump the side of the nose of the saddle with the heel of your hand and see if it moves. Penetrating oil almost always works eventually.