IBM 3151 User Manual page 48

Step 10. Positioning the Video Element
Customers who do not have the stand (optional):
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If a stand is not available for the 3151, do this step .
Customers who have the stand (optional):
Skip this step; go to page 2-24 .
Lift the rear of the video element to slide the tilt foot as needed .
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Chapter 2. Setup Procedures
2-23