23 Setting Up the BassNS-NXT4/5a Radius Bass Owner’s ManualAdjusting the truss rodImproper truss rod adjustment can permanentlydamage the neck. If you are unsure why and howto adjust neck relief, ask a qualified guitar and basstechnician for help.For adjustment, use a 5 mm hex wrench (providedwith the bass).• Turn the hex wrench counter-clockwise tolower the tension of the truss rod (the neckbows more due to the string tension), or• Turn the hex wrench clockwise to increasethe tension of the truss rod (the neck getsstraighter)