There are provided a method of efficiently establishing a security policy and an apparatus for supporting preparation of a security policy. Plastic is removed from the balancing feature during dynamic balancing of the armature. In this embodiment, each of the one or more discrete porous bulk matrix regions is defined by a plurality of acicular pores that extend through the substrate or support structure. Under such conditions, the control moves the compressor to a less loaded mode of operation such that it is less likely that the protection switch will actuate.