I've just mounted my Samsung UN55D7000 and UN46B8000 two weeks ago. Using this mount: Amazon.com: VideoSecu Tilt TV Wall Mount Bracket for Most 32"- 65" LED LCD Plasma TV Flat Panel Screen Free HDMI Cable and Magnetic Bubble Level MF607B 1QH: Electronics Since both TV's have the recessed screw holes in the back, I had to use the longer M8 screws along with the black nylon spacers that came with the wall mount to put on the vertical arms. After putting on the vertical arms, I find that the vertical arms have a tiny bit of play or wobble, it's not pressed tight against the black nylon spacers. It seems like the M8 screws are 1mm-2mm too long. Is this normal?