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You will absolutely have to get set up with a hose connection like I described, or whatever vacuum you pull will be lost the moment you unscrew the adapter with the internal nub.
I would not redo flares without testing them first, as you will end up chasing your tail bigtime with that approach.
Air from and air compressor would work for the purpose of soapy water leak testing of your copper line fittings, but there is a risk of pumping who know what into the system (oil, trash from inside the air hose, etc.).
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