Clamping Jig for Odd Angles
It is frustrating to clamp together two boards precisely at an odd-angled corner. This jig, which can be made quickly from scrap lumber, will help. Cut a generous scrap of hardwood to the appropriate corner angle, and drill holes through the scrap, as shown, to accommodate the head of a clamp.
Use two clamps for each jig piece, one on each of the two boards forming the corner. Make sure the inside corner of the joint is firm against the jig. One jig should suffice for joining narrow boards. Wider pieces will need two jigs, one on each edge, as shown.
From Fine Woodworking #123