The meaning of wing is more spiritual than of a mechanic reality. And it's the same for the concepts of integration and disintegration. We currently say that an enneatype integrate in one direction and disintegrate in another direction. 4, for example, disintegrate in 2 and integrate in 1. But it actually seem that we can move in both direction in both situations. I've read that the wing actually indicate in what direction we are the more prone to move under stress, wich is actually, the number we seen folllowing the direction indicated by the wing.
A 6w7, for example, tend more to move in 9 under stress: they are not certain of anything, ar opened to every type of ideas and need to considerate every point of view or angles of an issue. Don't know how to act. Turn in circles. Stuck with routines. Eventually passive-agressive and obssesive, prone to fantazy. They became also very meek and accomodant, often of a self-pres subtype, characteried by a personal warmth to disarm potential hostility. While 6w5 disintegrate more in 3 under stress, their attention is more focused on one point at the same time, and to become more knowledgable and efficient in order to secure themselves. They are more likely to stick on a point and to not deviate in order to cope with their anxiety. When more relaxed, 6w7 integrate more often in 3, tons of creative projects, see life large, be positive. While the 6w5 become more inquisitive more open to new ideas, more warm, more creative.
An 8w7 move more to 5 under stress. Become overly mental. Vindicative. Move from avid to stingy. Withdrawn from peoples to avoid responsability and guilty, romantise isolation, consider that it's a privilege to receive attention from him. Fearful and paranoid. Find a refuge in his ideas, inquisitivity and intelectual interest as an other way to confront with their fears. 8w9 move more to 2 under stress. Stress reanimate fear of loss and separation. Feel co-dependent, but don't want to appear weak. Blame peoples for betrayal, megalomanic, can cope with their fear of separation by seduction, sensuality or agressive sexuality. When more relaxed, 8w7 move more to 2, are generous and gregarious, larger than life and lover. While a 8w9 move more to 5, economise his energy, strong quiet and quiet force and self-confidence, more inquisitive. Contrary to popular belief, Darth Vader is not 8w9 but an 8w7 disintegrate in 5, and James Brown was a 8w9, not a 8w7.
9w8 move more to 6 under stress, self-forgetting of their need, they fit in, but are also prone to occasional outburst of anti-autoritharism. While 9w1 feel a need to do things perfectly and move more to 3. When relaxed, 9w8 move more to 3, using their wing 8 to become achiver and performer and impact the world. While 9w1 work more to apply their perfectionism to collective causes. 9w8 is "I have a lot of potential energy...a lot of potential assertive energy, just wait a little and don't piss me off" 9w1 is "I have a lot of potential energy...a lot of potential compliant energy, just leave me the time to do do things perfectly".
I could contiue, but the idea is that you can determine your wing by seeing toward wich direction you are the most prone to integrate or dinsintegrate. If you are a 4 and move more toward 2 under stress and integrate in 1, you are a 4w3, if it's the contrary, you are a 4w5.