Virtually all guitars built today have double action truss rods fitted. They will engage in both directions - generally clockwise to reduce relief and anti clockwise to add it. There can be a point, often when the neck is dead straight, that the 2-way truss rod is not "engaged" and the nut spins easily. If you want to add relief then you need to go past the slack section until the rod starts to engage again.
This may be particularly noticeable if there is a little "room" in the truss rod channel.
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I'm learning to flatpick and fingerpick guitar to accompany songs.
I've played and studied traditional noter/drone mountain dulcimer for many years. And I used to play dobro in a bluegrass band.
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