Air adjustment screw ... where is it?

This is a pretty dumb question, but in another thread someone suggested adjusting the air/fuel mixture on my carbs using the air screw. Looking at the carb diagram from the service manual, I don't see anything called an air screw. Could someone please point it out? The bike is a 1980 KZ750.

Thanks,
Chris

#49 "pilot screw"

Good Luck!

Thanks! I'm going to need it!