I would recommend incorporating some 1/2 inch angle iron up the left side secured with some carriage bolts and wing nuts and to the right of the two hinges that allow the top to fold down. Also place some angle iron horizontally above and below the hinges that fold the rights idle of the barricade. Doing this should give the barricade plenty of rigidity when in use. You want a super solid barricade for training. Having a flimsy barricade can be counter productive.
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