1. A METHOD OF FABRICATING AN ARTICLE COMPOSED OF A DIELECTRIC BODY HAVING A FREE OUTER SURFACE AND AN AXIAL RECESS, AND BEING PERFORMED TO A PREDETERMINED OUTSIDE DIAMETER OF A MATERIAL HAVING THE PHYSICAL CHARACTERISTICS OF POLYFLUOROETHYLENE IN SOLID STATE, AND OF A RIGID INSERT HAVING ON A STEM NON-CIRCULAR AND ANCHOR PORTIONS, COMPRISING THE STEPS OF: COMPRESSING SAID BODY AT SAID OUTER SURFACE IN SOLID STATE TO AN OUTSIDE DIAMETER SIGNIFICANTLY SMALLER THAN SAID PREFORMED OUTSIDE DIAMETER OF THE BODY; PRESSING THE INSERT INTO SAID RECESS OF THE BODY WHILE THE BODY REMAINS COMPRESSED IN SAID SOLID STATE TO SAID SMALLER DIAMETER, BEING THUS HELD AGAINST DISTORTION OF SAID COMPRESSED OUTER SURFACE DURING THE ENTIRE TIME OF FABRICATION; AND RELEASING SAID BODY AFTER COMPLETION OF THE PLACEMENT OF SAID INSERT TO REGAIN SAID FREE OUTER SURFACE; WHEREBY THE BODY MATERIAL FLOWS INTO THE SPACES AT AND BETWEEN NON-CIRCULAR AND ANCHOR PORTIONS, AND THE OUTSIDE OF THE BODY RETAINS SAID OUTSIDE DIAMETER ESSENTIALLY UNDISTORTED.

8. A COMPOSITE ARTICLE COMPRISING: A DIELECTRIC BODY MADE OF A MATERIAL HAVING THE PHYSICAL CHARACTERISTICS OF POLYFLUORETHYLENES, HAVING A PREFORMED COMPLETELY UNOBSTRUCTUED FREE OUTER SURFACE AND HAVING A CYLINDRICAL AXIAL RECESS; AND A RIGID INSERT HAVING WITHIN SAID BODY A STEM, AT LEAST ONE ANCHOR PORTION EXTENDING FROM THE STEM WITH A SHARPLY EDGED TAPER PERIPHERALLY TERMINATING IN A SHARP EDGE WITH OBLIQUE EDGE ANGLE, AND AT LEAST ONE NON-CIRCULAR STEM DEFORMATION, SAID BODY MATERIAL FILLING THE SPACES AT AND BETWEEN SAID ANCHOR PORTION AND SAID STEM DEFORMATION; WHEREBY SAID FREE OUTER SURFACE OF THE BODY REMAINS ESSENTIALLY UNDISTORTED, AND THE SHARP EDGE TRAPS THE BODY MATERIAL TO RESIST PULLING OF THE INSERT FROM THE BODY IN THE DIRECTION OPPOSITE TO THE TAPER.