Carefully set the cabinet upright, working with a helper, if necessary. Use four more bar clamps to secure the sides to the front and back, aligning two clamps with the top rails of the front and back and the remaining two with the bottom rails. Be sure to protect the stock with wood pads. As soon as you have tightened all the clamps, use a tape measure to check the safe for square (above), measuring the distance between opposite corners; the two measurements should be equal. If not, install another bar clamp across the longer of the two diagonals, setting the clamp jaws on those already in place. Tighten the clamp a little at a time, measuring as you go until the two diagonals are equal.
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