Today’s new streamline flat panel TVs are designed to be suspended from a wall with a mounting device attached to a wall. The mounting device makes the TV screen a part of the wall, eliminating the need for a piece of furniture to hold it. The mounting device is a permanent installation on the wall; some designs allow the screen to swivel, rotate or be tilted for viewing. If the screen is high on the wall, the power cable from the screen can be concealed by using a cord cover to hide it. A handyman or service contractor will charge $350 to install a 40-inch screen on a heavy-duty swiveling wall mount for a large screen. That includes labor and material. If you are handy and have carpentry tools you can buy the mounting device for $193 and install it, saving 45% for your effort. That’s assuming you have carpentry …