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Using a big ol' jackhammer.
it's patented technology but you could roll you own for personal use.
The deck model picture supports 2500lb. There's another model with a steel pocket for a 4x4 post that supports 5000lb each. There's a plug in the bottom so it doesn't fill with dirt and a cap on the top so it doesn't fill with water.
The angled pins would resist uplift as well as supporting the load.
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