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The Hog Whisperer (Administrator)
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Depends how rough they are.  If they are scratching cases due to burrs, it's very simple.

My method is to get a short length of steel rod, about 3/8" diameter, and about 4 inches long.  Split one end with a hacksaw for about an inch.

Cut some strips of 400 grit wet-or-dry sandpaper an inch wide.  Wind a strip, grit side out, around your rod with the strip starting in the cut you made.  Wind just enough to get a snug (but not overly tight) fit in the chamber.

Chuck the rod in a drill.  Wet the chamber down with WD-40.  Note you should wind the paper in the same direction as the drill will turn!  Hold the cylinder in your hand, so that it can center itself on the polishing rod.  This works with either a hand drill or drill press, drill press is easier.

Give each cylinder 20-30 seconds with a new strip for each cylinder.  This will knock off the burrs but hardly change the dimensions of the cylinder at all.  They are very hard.  It won't even take much of the bluing out.

Another suggestion, somewhere on this board, was to coat an old case with jeweler's rouge, and rig up a piece of a bolt or something to go through the case head so you can chuck it in a drill.  Basically the same thing using a different medium to carry the polishing compound.  Of course you have to drill out a hole in the case head to get a small bolt through it - you get the idea.

Hope this helps.
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