Abstract: A wheel nut assembly for fixing a wheel to a vehicle hub which includes a wheel nut with an internal thread; a wheel stud having an external thread to co-operate with the internal thread of said wheel nut and having an end portion adapted to project beyond the wheel nut which end portion includes axial grooves o ribs on its external surface; a retaining cap with internal grooves or ribs complementary to the external ribs or grooves on said wheel stud adapted to fit over said wheel stud and said wheel nut; and means to secure the retaining cap to said wheel nut. The retaining cap prevents rotation of the nut once it has been tightened In some embodiments an aesthetic cover is provided to improve the appearance of the wheel. This aesthetic cover may also be used to lock the retaining cap to the nu and provide an indication that the nut is securely fastened.

Abstract: A push-on fixer for screw engagement in which a plurality of radially extending notches are formed in a circumferential edge region of a circular hole formed at a center portion of a thin discoid body, and a plurality of inner plate spring pieces are formed on the circumferential edge region of the circular hole so as to allow insertion of an aiming screw into the circular hole and so as to clamp the inserted aiming screw, is provided. An aiming screw is inserted into an aiming screw insertion hole of a lamp body of an automobile head lamp, and is retained so as to be prevented from coming out of the lamp body. A plurality of outer plate spring pieces which press against a push-on fixer abutment surface of the lamp body and a plurality of clamp release claws for releasing the clamping of the screw by the screw clamp plate spring pieces are formed on the outer circumferential edge of the thin discoid body.