@Kim McCann, Thank you very much for that sage advice. When I broke the 0.3mm nozzle, I was screwing it in with the wrench so as a noob, I have learned my lesson. So, now I know that they are extremely delicate and how to install them. I also have learned that a 0.3mm nozzle is more than adequate for my needs. I was trying out the 0.2mm nozzle beforehand and decided to go back to the 0.3 nozzle when I broke it. Like I said before, this is a cheap Chinese airbrush that does resemble the Master Airbrush economy models so maybe I will someday buy a replacement nozzle for it. The kit I bought came with three needles, two nozzles and a 0.5mm nozzle cap with no 0.5mm nozzle. So, I can't even use the 0.5mm needle at all. I contacted the ebay seller about this and I am waiting for a reply. Meanwhile, I am taking in all of the information and suggestions that have been so graciously provided for me here.