Method for identifying compounds useful for the therapy of cancers in which the activity of Myc is causally involved. The insert includes a body including a stem having a plurality of radially extending ribs inserted into an aperture in a first leaf spring. The warhead includes a frangible container within the outer casing of the warhead and a destructive element within the frangible container. In one embodiment, the feedback may be transmitted in the symbol that is kept as gap in the D2D subframe.