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I would caution against too much sanding of internal parts. Some are only surface hardened and if that hard skin is cut through the part will wear rapidly. As to finish, there should be no need to finish internal parts at all. Many manufacturers do not, and if they do, it is only for looks since neither bluing or Parkerizing hardens parts. Parkerizing, in fact, can make parts rough and will not improve functioning.
Jim
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