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@roadwarrior
The heat thing generally works, though I've heard only if the stem is made from different material to the fork (usually are, some kind of light alloy vs steel) As they expand and contract at different rates. I used a blowtorch, heated then dunked it into cold water, and kept repeating. Then used a long metal bar for leverage and kept twisting until it budged. Plus a few whacks through the steerer with lump hammer and a steel rod. Took forever a couple of days of various processes but got there in the end. Cracked the stem in half though.