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Monster1985
Jonny69
Dagnabbit, you've got me designing the damn thing now.
Key thing working against it is the big diameter (63.5mm). Pressure = Force / Area. Area is 3167 mm^2 = 0.003 m^2. 9 Bar = 900,000 Pa. Load is therefore 2850 N (285 kg) to make 9 Bar of pressure. With a 10:1 lever ratio, we can bring that down to a more manageable 28 kg. The question becomes more about whether the rubber seal can hold that pressure and if it can take 285 kg on the back of it.
So, realistically, leaning your weight on an Aeropress actually only makes between 1 and 2 Bar pressure depending how much of your weight is actually on it. I'd never really considered what it made before.