If they are black and smooth try it in the ground but dont go deep. Old timere told me that long ago. Cultivator shovels will scour when black as long as they are smooth. Sure wont hurt to plow some to see what happens they could have been coated with something to make them black. Being smooth is whats important. Just remember to not go deep its alway worked for me on a couple of plows. A sanding disc with 120 or so grit will help also you dont want rough or the finish will have marks no cut-off wheels they will leave the surface too rough.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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