10-32 thread replacement truss rod nut for vintage Fender (approximately '61-'70s and reissues) On Fender heel-adjust truss rods, the adjusting nut might have recessed over time below the end of the neck, because of wood compression or an earlier truss rod repair. These replacement 1-1/4&;quot; (3,2 cm) long nuts keep the adjusting slots accessible.