Then while you're putting pressure on the headstock, turn the wrench clockwise to tighten the truss rod. Important. Again, only turn the wrench clockwise 1/4 of a turn. You should be able to see a difference after a quarter turn. If not, try a little more, but I'd still recommend no more than a half a turn per day. Wooden necks require time to "settle in" to truss rod adjustments.