Here is the post I made about the arm when I first acquired it.
viewtopic.php?f=15&t=5977It is very solid, holds the screen in place when you poke at it for stop changes and yet can be easily positioned just about anywhere you want. I sometimes pull a chair up in front of the computer tower and swing it around to use in that position. I've only had to adjust the tension once in four years. It comes with an allen(alan?) wrench to adjust the tension spots in the arm, and there are four screws on the enclosure that hold the tilt ball for the monitor that allow you to set the tension there.
It attaches one of two ways: 1)a clamp that is meant to hold it on the edge of a desk without having to drill the desk, or 2) you can drill a small hole through the surface and the is a steel u-bar and wing nut that clamps it down tight to the surface.
I see they have gone up in price, but it is a high quality arm, well worth I think.
http://www.innovativeessentials.com/swi ... p-139.htmlJohn