a coiled section of a plastic sheathed stub cable is placed on a support which is orbited about a longitudinal axis of a straight section of the stub cable . the straight section of cable is positioned coaxially within an aperture formed in a casing part which is mounted in a rotating nest . the juncture between the apertured casing and the cable sheath is heated , whereafter a bead of bonding material is extruded around the juncture . a molding die is moved onto the extruded bead to force portions of the bead into the juncture to form a homogeneous weld with the cable sheath and casing parts while uniformly shaping the remaining portions .