Rondo,
I've been using one of the Harbor Freight refill adapters for years, just saw them in a Wally World in OR too.
They work best if the small bottle is cooler than the tank and the tank is upside down to put liquid in the small one. I get new bottles yearly anyway just to have no leaks.
Oh, and it is illegal to transport refilled bottles across state lines, courtesy of Dept of Transportation.
I'm sure someone will relate a tale of a guy who did and blew up his rig, or got caught and fined thousands, or his insurance failed to renew or something.
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