I'm wanting to get an articulating arm for my LCD TV, but the only problem is that there is not a stud in the wall to mount the arm. There is a space about 3 feet between two studs. In the middle of that space is where I would like to mount the arm. Is there some kind of wall bracket that I could mount the articulating arm on that would be attached to the two studs? The total weight of the articulating arm and TV is about 42 pounds.