There's not much information on this carburetor on the internet. My guess is this was a design unique to McCulloch's specifications for the Scott 60 and 75 hp motors.
Model N-3008S Parts:
|Float & Lever Assembly||21-163S|
|Inlet Needle & Seat||25-399S|
|Metering Rod Spring||61-612|
|Metering Rod, Standard||75-1481|
|Metering Rod, Lean (High Altitude)||75-1506|
|Metering Rod Pin||150-260|
The metering rod pin (seen in the illustration as #20) was bad on one of my carbs. The head wasn't round and it allowed the metering rod to jamb next to the head. I replaced the bad pin with a homemade pin that started life as a nail.