another noob/rube question

7

72gs455

So I bought one of the 15 dollar purple harbor freight guns, used it a few times and it seems to be working fine. I take it apart and clean it. Every thing is still working fine but the fan is not as wide as it once was...

I know how the needle to allow paint flow operates(back of the gun) and I know how the air pressure screwwy thingy works (bottom of gun).

Here is my question... the knob on the left side, is this to adjust fan size?:confused:
 
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