IBM 3151 Manual To Operations page 33

Step 8. Positioning the Video Element for Viewing Comfort
a
Customers who do not have the stand (optional):
If a stand is not available, do this step.
'Customers who have the stand (optional):
Skip this step, go to page 2-13 .
Lift the rear of the video element to slide the tilt foot as needed.
2-12
IBM 3151 Guide to Operations