You must mean the low speed adjusting knob as these motors have a fixed jet for the high speed. Only the low speed is adjustable. On models with two knobs, the low speed one is shorter than the high speed knob so it will clear the choke knob.
Here’s what I found for a low speed knob. All measurements are +/_ a bit. Hope this helps! If you meant a high speed knob, all measurements are the same except the paddle is about 0.235″ longer.
