[kc8adu]

you need a plumb bob and level
the level lets you stretch a string exactly level across the center of the screen.
the bob does the same vertically.
use these as a reference when setting the green geometry as perfectly as possible.
once you get the green perfect you adjust the red nd blue to it.
think of the controls as size,width center,lin ect.forget what you know about old delta gun work for now.
cover red or blue and work on getting it one with the green.
repeat for the other.
take your time and it should come out near perfect.