Leaks from spigot

I originally had the assembly about medium hand tight. That leaked like there was no tomorrow. I now have it cranked down to as tight as I can possibly get it, to the point I think it might break if it goes any tighter. That still leaks, about 10% of the original leak. There are still a few drops on the floor within a few minutes after filling a glass. Whether that is coming from the connection or from the spigot internally, it's a design flaw none-the-less.

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