I have the same brush. =]
Based on your description I see several potential problem causes.
1) You have disassembled the airbrush for cleaning several times and now it's not working as intended.
> check for correct assembly, is the trigger inserted properly, i.e. does it release air when depressed, is the needle seated correctly in the nozzle?
> check for bent needle tip. replace bent needle with same size replacement part. Alternatively, swap in the other needle/nozzle pair to exclude the needle.
> Since you have the 2in1, I assume you are certain that you didn't mix the two different sized nozzles and needles.
2) You mention you used an ultrasonic cleaner to clean your brush. I assume you also added airbrush cleaner or other chemicals.
If you flush your brush with airbrush cleaner after the paint is through, you shouldn't even have to take out the needle. If your brush clogs up a lot, your paint is not thinned enough.
Ultrasound will not harm your brush, but prolonged exposure to chemicals can harm the seals in the brush.
> remember how long you bathed the brush with chemicals, if it was a long time you might have damaged seals. That isn't covered by the warranty.
> did you use any cleaning brushes? Those as well might danage the seals. Same, not covered by warranty.
> after chem bath cleaning your brush, its lubrication will be gone or degraded. As such it won't work properly and you need to relube it. I'm not sure what you use for that, be sure not to just pick anything as it might make things worse. Consult your dealer or find an official recommendation on the web.
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