A brake screw, comprising: a screw member configured for retention within a threaded aperture of a mounting hub, for rotational adjustment to enable displacement in an axial direction; a brake member in axial alignment with the screw member and disposed for movement in the axial direction for engaging a mounting tube held within the mounting hub upon rotational adjustment of the screw member, wherein the brake member includes a braking surface that can contact an outer surface of the mounting tube, wherein the braking surface is a pre-curved braking surface and wherein the outer surface of the mounting tube is a curved outer surface, wherein the pre-curved braking surface can match the curved outer surface of the mounting tube, to enable mating contact between the braking surface and the curved outer surface of the mounting tube; a rivet section integrally formed with the brake member and having a distal end retained within an axial recess formed within the screw member, allowing movement of the brake member in the axial direction within the screw member; a bias member disposed between the screw member and the brake member to create a biasing force that urges apart the screw member and the brake member along the axial direction, to thereby apply a braking force between the braking surface of the brake member and the outer surface of the mounting tube, in order to retain the mounting tube in a fixed position; characterized in that the brake screw further comprises an index mark formed as a screw drive on the distal end of the rivet section, the screw drive dimensioned to receive a mating driver tool for rotational adjustment of the brake member to orient the pre-curved braking surface into the mating contact with the curved outer surface of the mounting tube. a screw member configured for retention within a threaded aperture of a mounting hub, for rotational adjustment to enable displacement in an axial direction; a brake member in axial alignment with the screw member and disposed for movement in the axial direction for engaging a mounting tube held within the mounting hub upon rotational adjustment of the screw member, wherein the brake member includes a braking surface that can contact an outer surface of the mounting tube, wherein the braking surface is a pre-curved braking surface and wherein the outer surface of the mounting tube is a curved outer surface, wherein the pre-curved braking surface can match the curved outer surface of the mounting tube, to enable mating contact between the braking surface and the curved outer surface of the mounting tube; a rivet section integrally formed with the brake member and having a distal end retained within an axial recess formed within the screw member, allowing movement of the brake member in the axial direction within the screw member; a bias member disposed between the screw member and the brake member to create a biasing force that urges apart the screw member and the brake member along the axial direction, to thereby apply a braking force between the braking surface of the brake member and the outer surface of the mounting tube, in order to retain the mounting tube in a fixed position; characterized in that the brake screw further comprises an index mark formed as a screw drive on the distal end of the rivet section, the screw drive dimensioned to receive a mating driver tool for rotational adjustment of the brake member to orient the pre-curved braking surface into the mating contact with the curved outer surface of the mounting tube.