I am sure and I do not remember saying anything about loosing up the needle chuck , I said so you can pull back on the needle chuck when you have a clog. But no all airbrushes do not offer this feature .
The Paasche VL has a solid plastic handle that you have to remove to do this , But both my IWATA;s have this feature.
if you happened to have purchased one of the 3 in 1 handles for the IWATA's then you could also remove the needle with out taking the handle off at all.
I was giving a general answer to his question being he never stated what make of airbrush he has.
If you look at your own original answer, you also didn't mention pulling back on the chuck, I only understood that's what you meant when I read Seamonkey's answer, therefore I do
owe you an apology, I'm still new to all of this so excuse me if I'm a bit stupid sometimes.
I personally have got used to filtering my paint beforehand, and if I get a clog I blow back slightly then dump the paint and clean the brush before I put in new paint, one thing i have learned is that when you get one clog there are more to come, especially working for long periods and the paint dries in the cup, which is feature built into all H&S joke shop airbrushes.
I would rather throw away a little paint than risk damaging a very expensive nozzle by forcing dried paint through it.
And your absolutely right, when people ask for help, a little more info would save one hell of a lot of confusion and provide a more accurate answer.