OK, so i've measured the screen and attached a string cross hatch to it, i'm using the convergence test patterns on the avia dvd and I am noticing a couple of things, first this tv has a curved screen tilted forward so I am not sure how to take the keystoning into account when I measure the screen, up close the 4 sections look even, but from a distance they don't look right. The second is when I adjust the convergence I can get it right on one side but the other side is off. I ve figured out that the top row of 9 pots is for the red and blue, while the bottom row of 9 is for the green. There are 3 more pots inside the tv under the green crt, they are very hard to get at, and I no longer feel very comftorble sticking my hand in there with the tv on since I got shocked adjusting the drive on the blue crt.