My previous favorite method to remove a hard to remove fixed up from a bottom bracket served me well. I used it to remove a bunch of fixed cups. But I finall
The Retrogrouch: Removing An Extremely Stuck Bottom Bracket
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repair - How can I remove a stuck bottom bracket cup? - Bicycles
自転車メンテナンスガイド - スープdeスパンク
Removing a seized bottom bracket cup
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自転車メンテナンスガイド - スープdeスパンク
An improvement on Sheldon's fixed cup removal tool - Arcady Genkin
Bottom Brackets