A magnetic disk unit includes a magnetic disk attached to a spindle so as to be rotatable, a slider having a magnetic head for readingwriting data ontofrom the magnetic disk, a suspension for providing the slider with a predetermined load, and an actuator arm for positioning the slider attached to the suspension on the magnetic disk. Said display means and complementary display means are movably mounted to rotate synchronously, at a given moment, relative to said oscillating weight. Put spiral item 2 and two groups of transitional linking parts item 3, item 4, item 5 and item 6 into and are sealed in a hollow quartz glass pipe item 1, thus this electric heating element is formed. Debris drawn against the screen’s exterior is dislodged by a rotating spray arm that contains nozzles and is disposed within the strainer interior to spray water against the screen. In addition, preferably the embedding step includes the step of embedding a respective one attachment engine within each of said applications.