Moreover, in some embodiments, at least one tooth 204 may be integrally attached to the outer support 202. For example, the tooth 204 may be welded to the outer support 202. The tooth 204 may be spot-welded to the outer support 202 in some embodiments. The outer support 202 and the tooth 204 may be formed of the same material (Si-Steel) in some embodiments to facilitate the welding process. Those having ordinary skill in the art will appreciate that, during the welding process, material of the outer support 202 and tooth 204 may melt, pressure may be applied, and the materials may fuse together to integrally attach the two parts. It will be appreciated, however, that the teeth 204 may be attached to the outer support 202 in a different manner without departing from the scope of the present disclosure. For example, in additional embodiments, at least one tooth 204 is attached to the outer support 202 via a brazing process.