I have an Apple 12" RGB monitor that doesn't use the full width of the screen. The top and bottom go to the edge of the screen, but the image needs to be stretched horizontally. On the back of the monitor I see tiny holes that let you adjust the screen position and the vertical height, but no horizontal adjustment. The unused area is approximately 3/4" on either side.

Am I missing something obvious, or is this the correct behavior for this monitor, or is there a way to adjust it if I crack the monitor open?

Thanks.