When cutting box joints on the tablesaw or router table, I attach a scrap piece of Baltic-birch plywood to the back of the workpiece with double-stick tape. After the joint is cut, I remove the plywood backing and turn it into a caul by paring a little off the inside corner of each pin with a chisel. This keeps the pins from interfering with the joint assembly and reduces problems with glue squeezeout. I give the caul a quick spray of shellac and attach it to the workpiece with double-stick tape, lining up the fingers. Two of these, one at each corner, ensure a tight joint. Jim Richey
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