It would take much longer than half an hour to get to 500 microns through a cap tube, even worse than trying to pull through a TXV. Even 1/4" hose starts becoming restrictive at such low vacuum levels.
Just braze in a high side service valve. They're cheap and there's no way you'll get it tuned right without a high side reading.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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