Well I braved the tube today and got it straight. It's not 100% but it's better than it was. One question though, how much of a black bar should there be around the picture? I know all older monitors have a picture smaller than the actual tube (overscan?) but I'm curious if this can be adjusted. Right now there's about an inch at the top and an inch and a quarter or so at the bottom.
Tempest

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Well done, Tempest -- congrats! As to the question about raster size, you have considerable freedom if you don't care about WYSIWYG. The factory endeavors to adjust dimensions so that there are 72 pixels/inch (the same as printed). If such dimensional accuracy is unimportant to you, feel free to tweak the height and width at will. Just try to maintain the correct aspect ratio to minimize geometric distortion. A simple way to do so is to use a piece of paper, oriented with a corner pointing upward and in the center of the screen. Use the default (gray) desktop pattern. The aspect ratio is correct when diagonal rows of dots lie along the edges of the paper.