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Here's the missing information
on April 8, 2012
Although the description states the monitor mounting bolt pattern is MIS-D, it does not state what size. So, before I bought the arm, I looked at Ergotron's site which states it is 100mm & 75mm. The unit I received actually has an Ergotron sticker on it -- so there is no doubt it is an HP-branded Ergotron unit -- and it does indeed have MIS-D holes at 100 & 75.
Another thing the description missed is the desk clamp's thickness capacity. The desk clamp is basically two assemblies: 1) the bracket the arm base attaches to, and 2) the hand screw that tightens it all to the desk. The screw can bolt to the bracket in three possible positions, each 1" apart -- and a hex-key is included so you can take it apart and reassemble it where needed.
In the first position, and the screw retracted fully, the arm can be clamped to desks that are approximately thinner than 5/8" (in this position I couldn't attach it to a 3/4" desk). In the middle position, the arm can be clamped to desks that are approximately 3/4" to 1 3/4". And in the widest position, the arm can be clamped to desks up to approximately 2 1/2" thick, maybe a tad more. The screw itself can be tightened through a range of 1 1/4". Again, this is all approximate because I didn't make measurements until after it was attached and I was writing this review.
There is a second mounting method. Parts are provided to eliminate the clamp and convert the arm base so it can be attached via a bolt through a hole in the desk. This has the potential to be more sturdy -- there will be no flex without the clamp -- and also will allow mounting inward from the edge of the desk (i.e., the regular clamp can of course only be attached at the edge, but this method permits mounting anywhere on your desk you are willing to drill a hole). The bolt provided for this mounting method is only long enough for a 2 1/2" desk, but you can always buy a longer bolt.
All in all, the unit seems to be well made, mechanically sturdy and tight. The paint is good. The cable management is minimal.
The monitor can be moved through six axis: up and down, side to side, tilt and twist. Each section of the arm is 12", meaning if you have a clear path to the surroundings, it can move 2 feet to either side (i.e., 4 feet total), and 2 feet forward and backward (or, in the odd situation, even 4' if you were to swing it around to another desk behind your own. The center of the monitor can be as low as 7" off the desk surface, or as high as 17.5" off the desk.