Use a level to ensure the mounting holes for each arm are even.
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Prop the tv against the wall and measure the distance from the bottom of the tv to the center of each row of mounting holes on the back plate.
Clear the hole of debris.
On the wall measure the same distances up from the tape and make marks at the stud locations.
Put on your safety goggles and dust mask before you begin working as masonry dust is not healthy to breathe or have in.
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Mark two points in the center of each wall stud corresponding to these holes.
Next attach the wall mount by screwing in the top two lag bolts first then screw in the bottom bolts and check that the wall mount is level.
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Measure from the floor up.
Then hang the wall plate on the brackets so the complete mount is attached to the tv.
Cut a piece of cardboard to the rough dimensions of the television with scissors.
Measure the distance between the top and bottom holes on each tv mounting arm.
Make sure the template is centered on the studs and then drill the mounting holes.
Be careful not to over tighten them.
Using a level determine the desired height of the display before attempting to install the wall mount.
Tighten down all the screws.
Hold the cardboard cutout against the wall to determine.
Position the mount in the exact position.
Hold the mounting bracket against the wall within the borders of the marks made in step 1.