Abstract: A toroidal electrical transformer having a low voltage coil, a high voltage coil and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each continuous and form an arcuate elongated passage therethrough. The preferred annular magnetic core is wound in place in said arcuate elongated passage substantially from a continuous strip of magnetic material resulting in a toroidal transformer with continuous windings and a continuous wound core. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformers, its components and its sub-assemblies.

Abstract: An improved spring and expander cap assembly and method of attaching such expander caps to the opposite ends of a coil spring is disclosed wherein the expander cap is provided with a plurality of fingers which are deflected over the end coil of a helical coil spring. In a preferred embodiment substantially identical end caps are simultaneously secured to opposite ends of the spring.