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Tillotson throttle shafts do more than hold and control the throttle shutter/butterfly. The throttle shaft is specific to particular designed carburetor bodies to pull from different sides of the carburetor and in different directions. This helps to identify the application of the carburetor in many cases
This throttle shaft is designed for pre-2019 HS carburetor models. Tillotson has reused the HS series for newer carburetors that do not share parts with older HS models.