Help noob question.

[Rob Afton]

What does this adjust on my AB,seems weather it's tightened all the way or half way as in the two pics.
Someone told me it's paint control but I don't see a difference pic A is all way,
pic b is backed off a bit.

 

[Lt4-396]

I could be wrong but it looks like either
A. It controls how soft or hard the trigger spring is or
B. It controls how far the needle can be pulled back... i.e if you want constant hairline lines you adjust it so you can only pull it back a certain amount.

Turn it all the way in and see how much you can pull back for paint than screw it all the way out and see if there is a difference in the amount the trigger moves.

 

[musicmacd]

Looks like trigger tension to me

 

[JackEb]

MacD has it right. It's for Trigger tension. Wind it all the way into the airbrush for the most resistance when you pull back on the trigger.
There is no wrong or right tension, only what you're comfortable with