I made a hole for a stove pipe in my block walls by marking out the circle, and then drilling around it with a LONG hammer drill bit. I drilled an inch or so apart each time, and the bit went the entire way through the block. Then I took my mason hammer and broke out what was left on the inside and out. Worked great and looks good too. After I mortared the clay thimble in, you'd think it was layed in when they did the wall. If both inside and out need to be pretty you can drill a center hole, and then mark the inside and outside off of that, and drill from both sides.
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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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