A loose tongue has three advantages over using an integral one; it avoids decreasing the width of the boards; it gives the joint marginally greater strength; and a simple plough plane can be used to cut the grooves. Plane a groove down the centre of each board and insert a separate tongue made from plywood or solid timber (ideally cross-grained). Glue one groove and tap the tongue into it, then brush glue into the other groove and assemble the joint in cramps as described on page 26.
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