Monitor has height and tilt adjustment but will not stay at set height. Monitor sinks down and rests on monitor feet.
I figured it out! Just takes a phillips screwdriver and a 5/16" open end wrench to tighten up some nuts inside the plastic housing. The plastic housing doesn't come off with the screws, but has to be slightly pryed up to release the little plastic catches. Be careful though, you don't want to break the plastic tabs. It's ok to break maybe 1 because there are several to take up the slack. At first I thought it was the nuts that are 1/2" (there are two that are close to 2 springs. But that was just for the tilt forward and backward. Actually there are 4 nuts (5/16") that need to be tightened. Don't over tighten or it will not tilt at all. I took photos of the disassembled base. If you have skype, then skype me at "golfbob" chino hills, and I can send the pics or talk you through it. Good luck.
Tighten any screws that may be visible on the monitor stand.
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I also had to pry off the plastic cover that I have written on to get the wrench on the nuts. Also meant to say "do not over-tighten because you will not be able to raise or lower the monitor (not tilt).
Another view with plastic covers removed.
I also have a height adjustment problem with the hpf 1905. I can't find any way to tighten it up. It just sinks to the lowest level. It obviously has a weak spring or tensioner. Wonder is there is a replacement part?
Let me know if you find a solution.
Thanks for the good info the cover over the arms comes off in two pieces (top and bottom) it splits at the midline if you use a small screw driver and twist/pry it from the base towards the monitor a little at a time they come off without breaking any tabs. I repaired mine as mentioned above and it works and stands alone just fine.
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