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Can you get a die grinder in there? In cases like this, when encountered in the past, I would grind two flat surfaces at the end of the bolt so I can get another wrench on it, then lots and lots of heat (as others have mentioned), breaker bar, and a hammer. I use the hammer on both the end of the bolt, and on the breaker bar as opposed to continuous, increasing pressure, in hopes of snap-breaking it free. Otherwise... new upright or machine shop...
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Threaded Mode
