A new development in restoration is lightly machining bare steel surfaces to make them shiny, like when new. For example, notice the shine on the inside of the front brake calipers. Perkins takes off just enough metal to restore the shiny appearance to the raw metal (without affecting fit) and show a “just machined” contrast to the surrounding darker cast pieces. Mustangs are loaded with bare machined surfaces—spindles, rotors, rear drums, rear axle housings, transmission cases, bellhousings, and others. A little oil on the part will prevent surface rust from forming.