Embodiments of the present invention are directed to a microcontroller device having a microprocessor, programmable memory components, and programmable analog and digital blocks. The cantilever has an upper end connected with the display portion, allowing the display portion to rotate relative to the cantilever about a first axis. A local block on the volume may be marked, for example fingerprinted with metadata, to indicate that the local block has not been restored. The invention includes actuator arms embedding part of the magnetic proximity latch, actuators, and disk drives using the crash stop and proximity latch, as well as methods of making actuator arms, actuators and disk drives. A sensor in the engine exhaust monitors the hydrocarbon content of the exhaust and control valving controls the vapor to air intermixture in response to the monitor for maintaining a desired intermixture that produces the desired hydrocarbon content. The curved blade is used to collect debris in the gutter, and the shovel blade is used to push debris under a gutter strut.