Use lye and cold! water. Stop up any ports or flanges to prevent leakage, but leave an open top hole. We have Red Devil brand lye around here, but probably any lye is suitable. Mix it to thin paste/liquid, pour it in slowly! and stand back. It will get really hot and maybe spatter when it starts working, but it really eats garbage like that up, and doesn't harm steel or cast iron. However, it will eat right through aluminum or pot metal, zinc cast, etc. Try it and good luck.
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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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