Abstract: A jack has therein a longitudinal guideway in the back of which the free end of a printed wiring jack board projects longitudinally forward in the guideway and has laterally spaced conductive terminals on its top. The guideway is adapted to slidably receive a cartridge connector plug comprising a cartridge housing with a front opening for a longitudinal passage therein, a pair of axleless resiliently deformable lateral rollers in said housing back of said opening on opposite sides of said passage, and a flex bond unit longitudinally displaceably received in the passage and comprising a printed circuit plug board and a flexible sheet bonded to that board and having a forwardly projecting tail with laterally spaced conductive terminals matching those of the jack board.