Bought this mount for Samsung PN50A550. My studs are a little over 20 inches apart. Installation was pretty easy. The tricky part was tightening the screws on the bottom. My TV is mounted above the fireplace with a small 8" shelf so I can't look directly under the TV to get to the screws. The TV is so close to the wall that it was a bit difficult to try from the sides. Suggestion, turn the screws to be threaded before installation. If you can't lift more than 100 pounds easily, get someone to help you. The lifting was a bit difficult but my wife helped me. The fireplace shelf was also easy to put down when lifting.
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