Known chip equalizers for Wideband-Code Division Multiple Access employ a co-efficient calculator that implements a Minimum Mean Square Error solution to a least squares technique for obtaining equalizer coefficients in response to receipt of a pilot sequence. In one embodiment, identical insert halves are supported in corresponding insert cavities in the bearing block sections, and a small thin clip is secured between the sections to prevent relative rotation between the insert halves and the bearing block. This endstone extends at least partially above the elastic structure and is secured to the central part by a material connection between said central part and the bottom surface of the endstone. In doing so, a member is provided to fill a gap between an upper surface of each chip and the die. The energy required for moving the blocking element is supplied by the user when introducing the key into the key duct such that the load on the power source used for actuating the actuator is minimal. Additionally, fiber optic ribbons of the invention may include a secondary matrix.