A honeycomb-shaped substrate for catalyst is made from ceramic, has a straight-flow structure, and includes cellular walls exhibiting pore volumes, which differ partially, and a large number of cellular passages demarcated by the cellular walls. The device includes a first arcuate scoop adjoining an elliptical right side to an elliptical left side along a minor arc on both sides, a front edge of the first scoop forms a scraper. A hybrid windmill having the ability to simultaneously switch between energy for immediate use and energy storage can also be provided. The electromagnetic actuator can be used for an optical scanner by providing a mirror or a lens on the movable member. Embodiments of the invention may provide precise and repeatable positioning of the HGA because dimensional tolerances and vibrations in the mechanism are not transferred to the HGA once it is loaded on the test disc.