We have nitrogen at work. Will look into making a fitting to purge an old one when I find one to muck around with.
I'd do it inside a large zip lock bag. Use the end of a hose and aim it into the lens and scope body to wash out the air. Then let the bag fill a bit so there is no air in there and screw it together.
Doesn't matter now, looks like you have it sorted. Good shit
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