Does the needle valve have a hole in the end and a set screw?
If so take a piece of music wire (push rod or even an old hex wrench) that fits in the hole and tighten the setscrew on it and whamo, you have a needle vale extension after you bend a 90 degree bend outside of the cowl.
The hole is at the end like on this one!
The set screw is on the side of the needle valve in the picture.
Jason