I recently installed a new vanity in my bathroom, and have managed to get all but one drain connection leak-free. A small bead of water appears just below the locknut that connects the tailpiece to the sink itself. There are no leaks at the rubber washer--just below the locknut. It's not a dramatic leak. . .the water never even drips down to the vanity bottom.
What would cause this? How can I repair it?
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