The most reasonably priced component used on the Cn250 Helix 1996 (t) Italy Kph Carburetor is the Screw,pan,4x8.
This part-list fiche shows all the components that make up the Cn250 Helix 1996 (t) Italy Kph Carburetor .
In this schematic the "Screw-wash.,4x8" is used most often.