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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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