Here is a throttle shaft that is nearly extinct, but we got it in stock! The TSX-569 large bore Carburetor found on the D15 Gassers is a special throttle shaft only to the D15. The "D" series Tractors always had throttle shaft issues due to the design of the throttle linkage itself. In our rebuilding experiences with the "D" series Tractors, just about every Carburetor needed to have the throttle bores repaired. If you're restoring a D15 Gasser make sure the throttle shaft is in good shape!