Under most circumstances a mitered box can be successfully glued and clamped using rubber bands or plastic packaging tape to pull the corners tight. But there are times when extra clamping pressure is required. Two sets of these clamps is the perfect solution. You can buy more expensive miter clamps from a variety of sources, but these are less expensive and more satisfying, because you made them yourself. Start by cutting the blocks to length, and then use a Forstner bit to counterbore the shorter blocks for the hex nuts. Now drill through all the blocks for the long threaded rods. Use epoxy to fix the hex nuts in the counterbores and let the glue dry before gluing the short blocks to the long ones with Vs-in. birch plywood as shown.
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