Outer convergence is done with the yoke angle. The rings overlap the red/blue, then the resulting magenta to green grid. If you have magenta off along the entire top, or red/blue not overlapped there, tilting the yoke to the right when looking at it from the back will push the red out, but also pull the blue in on the outermost edge (left/right on a vertical orientation). I can get that outer area close, but the yoke is hella to the right.. tried for 3 days on and off and cannot get it exact.. this is the only monitor that is giving me this much of an issue.. I know on the amplifones some yokes seem to work far better than others with same hardware driving them (I do all mine out the back of the same Star Wars cab), so just a thought, but wouldn't mind trying a different one to see if it has an effect... after the time I have spent on this one, i'm very familiar with it particularily so it would be a good test.. This one also had 2 small magnets taped inside that I removed, but put back when it became obvious it worked far better with them in so am wondering if it was a munged yoke that was 'helped' out by these... I asked earlier if other people had those magnets and no-one chimed in so i'm thinking that may be the case..