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@clubman
Remember ali expands much more than steel when heated, so just heating the steel tube will only jam the seat pin in more tightly. This principle works well the other way round - for example when removing a ali crank from a steel BB spindle.
However the aluminium will just collapse if given enough heat, and as mentioned above, this happens before the brass in the lugs starts to melt. This is perhaps not a job for some one who has never previously handled oxy-acetylene.