bradster -
sorry to say it, but you'll likely never get the bolt out. the aluminum is galled & the threads are destroyed at this point. the safest / easiest bet is to source an upright from a wrecked car. they can be had on the cheap.
by the time you could even devise & implement a solution with your current upright, you will have spent more time & almost as much money as if you'd just replaced the upright.
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