What's the most rigid way to join 8020?

8020: Hidden Corner Connector Overview t slot corner bracket This is a set of 20x20mm right angle corner brackets with 9x6mm oval mounting holes Made from high quality aluminum alloy, these corner brackets are three cherries slot machine DIY Inside Corner Bracket DIY Inside Corner Bracket Other options would be to go with a T-slot type system, but this requires proprietary bars

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