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The most important thing is to do it in as low humidity environment as possible. You want 0% ideally, which is hard to get unless you can get access to a place with a really good HVAC system.
Purging isn't super important because it'll leak out of the scope in less than a year anyways. Odds are your 14 might have already lost it's nitrogen. Old school dudes used to put a small desiccant inside the unit to ensure any and all humidity will get taken out.
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