Yes, they can be sharpened. Dress the back (flat) sides lightly on a fine flat stone to remove burrs and sharpen the serrations at the same angle as they're originally created with an appropriately-sized file or curved stone. Depending on the size of the serrations you may also be able to use a piece of fine sandpaper (220 or so) wrapped around a dowel. If in doubt, use a sharpie marker as an index die--mark one serration with it and see if whatever you're using takes the color off. If not, use a different diameter dowel, file, or stone until it does. You'll probably have to re-dress the back when you're done, but you can give an old set a lot of new life by re-sharpening them if done with a bit of care.
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Today's Featured Article - Piston Ring Removal and Replacement - by Chris Pratt. Piston Ring Removal and Replacement - Replacing rings is a fairly easy process to stretch the engines usability between major rebuilds and cut down on that blue smoke and high oil consumption. Frequently, replacing only the rings is not advisable because by the time you do the teardown and measurement of the components, the pistons are often beyond the manufacturers specification or something else you find will signify the need for a major rebu
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