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Originally Posted by Excaliber
If Gessford uses nitrogen, something tells me that is the best way to do it. Consider this: I can't recall a SINGLE thread or post or comment related to a 'problem' with any of Gessfords work, ever. Maybe I've just missed such a comment, if it exists? I mean, surely you can't keep ALL the people happy ALL the time? Or can you... 
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Sean Hyland also uses Nitrogen to sleeve the aluminum modular blocks. I would have to re-read that section of the book to be sure, but I think he puts the block in an oven and the sleeves in liquid nitrogen. At room temp the sleeves are several thousands larger than the block bore. You could never press fit a sleeve that tight.