Joker Machine Knurled Choke Knob For Harley CV Carburetor Replace your stock plastic choke knob with this CNC aluminum knurled choke knob from Joker Machine. Stronger than the OEM choke knob that is sure to last you for many years to come. Features Chrome finish Replaces black plastic unit on stock CV carburetors Fully CNC machined and engraved from solid bar Attaches to cable stem with a set screw 1 (25mm) outside diameter, 1 (25mm) length