extends through seat 117 but not into cylindrical bore 115 of connector 111 inner ring 131 is located within connector 111 and may have an optional o ring 169 for providing a seal therebetween outer shoulder 143 on inner ring 131 abuts inner shoulder 123 in connector 111 in this test fixture version in the next step of the second embodiment fig1 ramming mandrel 151 is mounted to the shaft 171 of a press 173 and forced into the bore 135 of inner ring 131 as shown connector 111 inner ring 131 tubular member 161 and liner 165 are secured from extraneous movement for ease of understanding some of these elements are not shown in fig1 the oversized diameter of ramming mandrel 151 is readily received on the larger right side of inner ring 131 however as the ramming mandrel 151 moves toward the smaller diameter left side of bore 135 end portion 167 of liner 165 is plastically deformed between and into grooves 119 and 141 of connector 111 and inner ring 131 respectively inner ring 131 is also plastically or permanently deformed radially outward simultaneously grooves 119 141 provide enhanced grip on liner 165 between connector 111 and inner ring 131 the hoop strength of inner ring 131 retains the ends of liner 165 in engagement with the retaining surface of seat 117 thus each axial.