I use a Norton 4" round hone, smooth side to get the face of the nut and the face of the action smooth as glass. Doesn't remove much material on the fine side. Figure 8's and turn, figure 8's and turn slow even pressure with some penetrating oil or similar product. My preference is Kroil. Most of the time after I finish, the surfaces will lock when dry. Sometimes the machine marks are too deep but I still get it shmuth.
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