Fender Elite Series Precision Bass I amp II Owners Manual - Page 9

Insert the special 1/8" Allen wrench (supplied with the instrument) into the hole in the neck mounting plate. Rotate the wrench, gently, until you feel it engage in the hex socket. Turn the wrench clockwise if you wish to increase the amount of neck angle, counterclockwise if you wish to decrease the amount of neck angle. After the adjustment is complete, re-tighten the four neck plate screws, being careful not to over tighten. The screws should be tightened until they feel completely seated, but should not be forced. Overtightening can cause cracking of the fretboard. Re-check the alien screw to make sure it is not loose to vibrate. 131-FLEXTM TRUSS ROD (Pat. pending) Each Fender bass is carefully adjusted at the factory. The truss rod and string height are set for optimum action and playability with regular gauge strings. Under normal tension, the neck should have a slight concave curvature. By creating a counteracting force, the truss rod prevents the neck from bending excessively under the stress placed on it by the strings. The unique Bi-Flex'" Truss Rod allows adjustment of the neck in two directions -convex and concave. If you need to adjust the neck, see Adjustment Procedure #2 on page 9. 7