Abstract: The invention provides an insert for use in retaining an end portion of a cable in a socket. The insert has first and second ends and defines a central opening extending between the ends. A portion of the opening adjacent the first end of the insert has a diameter which forms a loose fit on the center wire of the cable, and the remainder of the opening is at least as large as this diameter so that during assembly a filler material can be entered into space around the center wire in the opening. The invention also provides an end assembly on a cable using the insert.