Adjust 2 way truss rod
Tutorial on adjusting a 2-way truss rod. The thing that gets most people is the slack spot in the static position- either direction from here will be fairly stiff, usually stiffer than a 1-way truss rod. Make sure your Allen wrench fits _exactly_. If there's no access hole, loosen the middle strings, reach inside, and reach around the soundhole brace. Pre-stress the neck. It's easy.
