Apparatus and methods are described, includingapparatus that includes a male-connector body comprising atleast one mating surface, and shaped to define a hollowcore. A plurality of electrically-conductive male-connectorterminals are coupled to the mating surface of the male-connector body.A longitudinal insert is configured to, bymoving inside the hollow core, push the male-connectorterminals radially outward. Other embodiments are alsodescribed.