Abstract: A tool assembly for use with a prime mover, such as a bench press, to prepare a flat cable for its termination in a mass termination connector. The assembly includes upper and lower supports, at least one of which is adapted for attachment to the prime mover, for reciprocal movement relative to one another. The assembly further includes punch means carried by one of the supports, cutter means carried by one of the supports and selectively operable stop means for limiting relative movement of the supports. The punch means forms a series of windows in the cable insulation between adjacent conductors of the flat cable, the windows being aligned in a row extending transversely of the longitudinal direction of the cable. The cutter means severs the conductor of the flat cable adjacent the windows. The punch means extends further toward the support which does not carry the punch means than the cutter means extends toward the support which does not carry the cutter means.