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If its an aluminium stem in a steel frame, the heat method won't work. Aluminium expands faster than steel under heat, you will just get it more stuck.
Last option is to cut through the quill where its vertical so you just have a stump sticking out. You should then be able to remove your headset and take out the forks. Then you can take your time cutting out the stem without a frame hanging off it.
PhilDAS-
If its an aluminium stem in a steel frame, the heat method won't work. Aluminium expands faster than steel under heat, you will just get it more stuck.
My case was an aluminium stem in a steel frame. It expands faster, but then it also contracts faster, no? Anyway my LBS got it to work using this method, but I don't have the details.
Tijs
Thanks for your reply. The heat theory sounds pretty correct, like sticking alloy parts in a freezer for a bit to ease installation