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ghostface
@Tijs
My LBS managed to get mine loose once with the help of a blow torche. Don't know exactly what he did, but I presume heat up the stem as I told him I didn't need it anymore. Paint (of the frame) was unaffected afterwards.
Something to do with heating up both the stem and the steerer tube, them both expanding due to the heat and then the stem shrinking more rapidly because of alloy vs steel? Someone with more knowledge/experience should correct me if I'm wrong though.