Originally Posted by Guessboy3
So you drilled straight through both the black board and the wooden backing and then ran the carriage bolts through?
Here's how I mounted my articulated arm mount. Drilled a pilot hole and used 2 1/4" lag bolts.. If you can find a 2" it'd probably work better, its just what I had on hand. Notice I had to use extra washers to "shorten" the bolt so it wouldn't go through to the other side. I wouldn't want to have to drill a hole through it all the way and have ugly bolt ends or nuts sticking through on the finished wood side.
I was honestly a little worried whether the 2 lag bolts would hold a TV securely but it has worked well for me for the past year. I can fully extend the arm and have traveled with the TV mounted and had zero issues with it.