Use the included 3/16" Hex-head tool to adjust the Vertical lens shift to center image vertically on screen. See the chart on page 12 for shift range available with the installed lens and screen size.
Next use the same 3/16" Hex-head tool to adjust the Horizontal lens shift to center image horizontally on screen. See chart on page 12 for shift range available. The tool will automatically center on top of the adjustment nut when inserted into the access hole.