A method and apparatus for securing an encapsulated transducer to an interface cup for attachment with a machine includes an interface cup configured substantially as a cylinder defined by a cylinder wall and a bottom wall closing a bottom of the cylinder, the cylinder including a first bore corresponding to an inner diameter defined by the cylinder wall, the first bore corresponding to an outside diameter of the plastic encapsulated transducer; a second bore extending through opposing sides defining an exterior of the cylinder wall transverse to the first bore; an undercut in the first bore intersecting the second bore; a cylindrical overmold surrounding the interface cup having the plastic encapsulated transducer disposed in the first bore, wherein injection of plastic flows axially of the overmold toward the interface cup and circumferentially into the undercut via the second bore, forming a solid interference therebetween upon solidification restricting axial movement therebetween.