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When I tried to fit it this morning, it was actually lifting the monitor up a bit at the highest tension so definitely strong enough.
What it can't do is torque the tilt mechanism high enough to be able to keep the monitor facing forward. It just droops down. I'm actually going to remove the tilt part of the monitors stand and jerry rig it to the gas arm with a bit of angle grinding to get it to fit. That should mean I can use the gas arm rather than the massive stand.
Is your gas arm strong enough? Most of the stuff I read said there weren't many arms which were strong enough not to droop over time.