No Paul, I have only applied this method to two needle carbs. Basically I tune for Best Idle and Best top end and then apply the bleed to correct mid range. As with any two needle setup (glow or gas) there sometimes has to be some playing with both ends as there is what I call "interference" between the settings and sometimes it takes a bit of time to get both right. The Progressive metering of the fuel that the two needle does should be rich at midrange if a glow carb is run on gas and this is what the additional (and quite large) bleed corrects. Although i have not tried it, I think an air bleed is missing the critical low speed metering that would make this work - I think it would be hard to find an acceptable setting that would allow enough air to bring the mixture into line without affecting the both the RPM (increase) and carb throat suction (low- or none). That said I have not tried it.