Spitfire/Datsun carb throttle actuator. Original in steel, my repro in aluminum. Weird rounded peg is where the throttle cable attached (mine will wind aorund the circumference.) The arc is the choke kick-down, the hole near the center is the accelerator pump, the other hole is the return spring that pulls the throttle to the closed position. I moved it down into the plane of the actuator A: to make fab easier and B: so the tension is radial rather than off to one side. Very rough finish: the bit was about worn out.
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