• I thought that both alu and steel had more-or-less constant coefficients of thermal expansion over the range of temperatures you can achieve in a garage... but I can't find any nice graphs, so feel free to set me right.

    Saw a google answers thing suggesting that heating alu inside steel might crush the alu when it expanded, making it easier to get out when it contracts again, which sounds (more) plausible.

    Anecdotally - heating never worked for me, though cooling has done.

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