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Get a bigger hammer. Just kidding, sort of. Gear pullers may have a hard time grabbing onto the crankarm depending on shape. Do you have any hard wood wedges or a pickle fork (ball joint separator)? Heating the crankarm may also help as the steel and aluminum will expand at different rates. If you do ride around the neighborhood to loosen it, dont take the bolt all the way out, just loosen it... could come off at an inopportune time otherwise.
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