A wire terminal structure capable of fully enclosing internal components to prevent external dust or impurity from entering the insulation case to affect the normal operation thereof. The strategically located hardfacing is typically passive in the normal drill mode, but active in the updrill drilling mode andor back reaming. Using the solutions of this invention, these achievements are possible for dynamo-electric machine components with very small spaces between accessory components that do not allow the passage of conventional wire lead manipulator apparatus. The suction port and the exhaust port are open to the second chamber. Optionally current switches establishing a read current path including the first and second free magnetization layer.