Flitz or Semichrome should clean the nickel nicely. A replacement blade should be easy to find, as stated earlier Brownell's should have a kit for about $10. The kit should contain the blade, screw and nut but may, or may not have the detent or spring. When you take the old blade out be sure to catch and save the detent and spring (order extras because when these puppies fly, and they do, they hide in the darkest corners).

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Non illegitimae carborundum