Bakster
He says, unchuck the needle, pull the needle back some, then retighten. Then just press the trigger like a single action, you should get paint. I never thought of that. That should work.
Yeah, should work.
Mind, I find there's a lot of snobbery about dual versus single actions. And, outside of the modeling world, there's rather a lot of "work" single actions get put through, and as a go-to choice.
Does that makes them ideal for miniature work? Probably not. Especially for where a person does not have the physical amount of room wanted to properly feather the spray.
A case can be made either way--and really, it's down to what a given modeler is most comfortable with.