If you notice your airbrush is not spraying straight and is spraying at an angle, you may have a bent needle. Here is how you fix this problem.
Remove the bent needle and find a hard flat surface to work on. (You may need the assistance of a magnifying Glass) Place the needle flush against the flat surface and using a Nickel or flat edged coin, press the nickel against the part of the needle. Roll the needle around to find the bent part and again press the coin flat against the needle, straightening it. Repeat until the needle is completely straight.