Shop › Replacement Adjustment Screw and Nut Only, 5/16"-24 threads, Each Image 1 of 1 Replacement Adjustment Screw and Nut Only, 5/16"-24 threads, Each $8.95 Replacement Adjustment Screw and Nut Only, 5/16"-24 threads. Add To Cart Added! Replacement Adjustment Screw and Nut Only, 5/16"-24 threads. C-421-2170-0 You Might Also Like Intake Boot Clamp - Large, Each $2.50 Piston Ring Set – Cast Top Ring, 88mm (1.5 x 1.5 x 5mm) (Ref. P/N: 311 198 16988) $49.95 Bolt-On Aluminum Valve Cover Set $53.95 Schadek Oil Pump Flat Late Cam - 26mm Gears $59.95 Sand Seal Pulley Kit, Machine-In (Supplied with Green Seal) $99.95