Not looking for magic. If there is pressure in the system and 0 in the tank, or better yet, if the tank has a vacuum, then attaching the tank should draw some if not all of the volume from the system.
Then I can just take it to the local ac shop and have the tack evacuated and a new vacuum applied to the tank. If I have to do this two or more times to lower the pressure in the system to where it is insignificant; that's OK with me.
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