Abstract: An apparatus for mating a structural element to a pair of frame members. The mating apparatus includes a stud carried by the element, a pin carried by each of the frame members, a brace positioned, during mating, so that inwardly turned portions formed at each lateral end of the brace engage a corresponding pin carried by the frame members. Structure is provided to urge the brace progressively closer to the structural element. As this urging occurs, the pins carried by the frame members are driven toward the structural element by the corresponding associated inwardly turned portions of the braces until the pins can be urged no farther. As this occurs, tightening of the frame members to the structural element occurs.