Vizio XMF1000 - Manual (Page 18)

OPTIONAL: If you want your TV to have a 9° downward tilt when
mounted, use the spacers ( part G) and the longer screws when
mounting the TV hooks.
3. Using the screwdriver, insert the screws and washers as shown.
Because each TV is different, your VIZIO TV mount includes
screws of different lengths. Use screws that can be inserted
completely.
Do not use a short screw if a longer screw can be inserted
completely.
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