Originally posted by spearce
I think you want to move your raster to the left and up (when looking into the lens) to move the image area away from the "top left" edge of the raster since the image is drawn on the tube face upside down.
When you look in the lens this should be pretty obvious. Increase brightness until you can see the raster (don't forget to decrease contrast to its lowest setting so you don't blind yourself). The raster edge should shake a little on the vertical retrace, should be in the bottom right side of the CRT faceplate.
Actually, I think that, to move an image down and right on your screen, you should, when looking into the lenses, move the raster up and right. Don't forget that the lenses flip the image in all directions, not only vertically. When you turn to face the PJ, you're adding a horizontal "flip" of your own. The two flips cancel.
For example, when I look into my M-8000's green lens, the 'no input signal' message is in the lower left corner, not the lower right. Interesting sidenote: the message is blackened in the red and blue CRTs relative to the red and blue "background", i.e., the rest of the tube faces.