Keeping clamps securely in place on a curved part, can be tricky. Here's an easy way to clamp curved edges while protecting them from marring. Cut the part 3/4" wider than the finished width to provide a rigid cutoff for use as a caul. To maintain a matched fit, do not sand the mating edges of the part and caul. During assembly, position the caul against the part, as shown, to provide a square clamping surface. After the glue dries, sand the curved edge of the part smooth, and then rout the edges as needed.