Patent ID: 6945729

Claim:
A structure comprising: a first material comprising a single plate having top and bottom surfaces, the top and bottom surfaces defining a hole with a surface to be threaded therebetween and defining a concave portion and a convex portion surrounding the hole and having diameters larger than the hole, the concave portion defined in the top surface, the convex portion defined in the bottom surface, the plate having a thickness of 1 millimeter or less adjacent the concave portion, and the convex portion extending a depth of at most one half the thickness of the plate; a second material contacting the top surface of the first material such that a hole defined in the second material is aligned with the hole, the concave portion, and the convex portion in the first material; and a tapping screw disposed through the holes, the concave portion, and the convex portion in the first and second materials to connect the first and second materials, a threaded portion of the tapping screw cooperating with a threaded surface of the first material that is tapped with the tapping screw, and a head of the tapping screw contacting the second material.