Late model (2001) carbs, wtf, main jet ID???

[Holocene]

In my experience, the main jet would be indicated by the arrow I've drawn. But that whole hex-nut unscrews, which is not included in my jet kit.

Could the jet directly "below" that actually be the main jet???

[arsenic]

what dude? The main jet unscrews with a flat head screw driver, leave the hex alone, thats part of the emulsion tube.

[Holocene]

what dude? The main jet unscrews with a flat head screw driver, leave the hex alone, thats part of the emulsion tube.

I tried unscrewing it, and the whole hex nut came out. I will now try to unscrew just the jet.