A method and apparatus for filtering pressure data from a pressure-sensitive device is disclosed. The accessory-mounting assembly is constructed such that it has a break away feature whereby an accessory-mounting component may pivot about a pivot axis when it is subjected to a substantial impact. In another aspect a method of fabricating a field effect transistor on a substrate comprises forming a gate dielectric layer and a gate over semiconductive material. Treatments include plasma treatment, irradiation and the application of acids.