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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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