Yamaha Weddington SeriesWeddington Custom Owner's Manual page 12

the nut tightens the rod and corrects for too much con-
cave bow. Counterclockwise rotation of the nut loosens
the rod and corrects for too much convex bend. Make
any adjustments gradually. Allow five to ten minutes for
setting, and check the curvature after each 112 turn of
the w s s
rod
nut.
concave
Note: Unless you have experience with truss rods, we
suggest that you entrust this adjustment to your
dealer.