Yes when you have the original non-FT you only have one screw.
When you have the FT manifold you will have 2 screws.
Both regulate air flow.
The feather touch screw is not adjustable it is either in or out.
For the NDZ question search, many people have asked this question.
Current Markers: Kid Arch 3.5, Grey/Silver 3.5, Redz Black/Red Ego7, Black/Black NXT