Abstract: An electric lamp is provided with an end having an annular recess which contains an insulating member which is secured to the lamp by means of at least two conductors which each extend from the lamp through an aperture in the insulating member. The insulating member and the annular recess are so shaped that the insulating member is held against rotation and lateral displacement with respect to the lamp. The insulating member has cut-out portions remote from its ends, preferably in a central portion, and most preferably configured to have two substantially octagonal portions connected by a portion in the shape of a rectangle, through which cut-out portions underlying material of the annular recess is exposed.

Abstract: A method of making a head disk assembly using a fixture is disclosed. The head disk assembly includes a base having an interior-horizontal surface and a side wall extending in a direction substantially perpendicular to the horizontal surface, a disk for coupling to the base, and a head for coupling to the base. The disk includes a head facing surface and an outer diameter and the head includes a disk facing surface. The fixture includes a light source for propagating a light beam towards the side wall, a light reflecting structure for receiving the light beam and outputting a reflected light beam, and a control structure for controlling a vertical movement of the light reflecting structure, the light reflecting structure includes a reflecting mirror surface defining an angle with respect to the horizontal surface.