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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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..for example, my LCD arm is 21'' at full extension. The top screw is 7" up from the bottom. This means there is a 'pry bar' factor of 3x. (21/7=3) So, that 66lbs of LCD becomes ~200lbs (198) of force, trying to pull the anchor out of the wall. (more, when handled)
Most anchors would likely hold with the wall stud, but, will it hold w/o warping the stud, and cracking the wall board? Do the math, and check the anchor spec's.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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