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Join Date: Mar 2015
Location: New Zealand
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Soaking with penetrant might help although with galvanic corrosion it won't penetrate. You might try an acid like vinegar.
Aluminium will expand more than steel when heated so hitting the spindle with a creme brule torch for a bit can help, though some say this is sketchy.
I usually get it with just a long pipe over a wrench. The amount of force the 15mm flats can take before a wrench would cam out is a lot. If you haven't stripped/snapped a wrench it's not really stuck.