Most of these arms lack the strength to hold up the original screen anymore. Probably due to fatigue of the spring. I still have one and it's just enough to hold it up but every time I hit the table it flops down :'(
I'm willing to pay for it sure, but I'm very worried about actually replacing it.. The force on that thing makes me feel like I'm unleashing a dragon and I have a feeling this is why they used very special screws, to avoid people messing with it.
It's also the shortest-lived Mac design ever so I wonder if this had something to do with it.
Too bad though because it was very beautiful and it had form and function, unlike current iMacs which are not height-adjustable at all.