If you notice your airbrush is not spraying straight and is spraying at an angle, you may have a bent needle. To fix this, use the sharp end of the Nickle to un-snag the tip of the bent needle

Now find a hard flat surface and use the flat part of the Nickle to roll out any bends against the hard surface. Roll the needle around to find the bent part and again press the coin flat against the needle, straightening it.