Two basic types of burr, one with spiral teeth down the sides of burr, sort of a circular flat file, and the other has many little individual teeth. All the above may also be ordered online also from dozens of vendors. There's much more specialized, hence expensive, grinding burrs for head porting & metal machining or finishing. I've found over the years that even the ones intended for woodworking can often hold up long enough to make a few slots in mild steel. If you start with a round file to get clearance you can then complete the slot with the flat file between drilled holes, but of course very laborious.Īlso local hardware will have various grinding burrs, either Dremel which are silly expensive, or other cheaper brands. There's many types of files, some having coarse teeth on the narrow edge of flat file. I find Lennox blades to be the best by far. The shorter the stick-out the less flex in the blade as you work. Found at you local hardware, it's a small cast aluminum or plastic handle that blade slips into, handle surrounds it, with blade sticking out from end. Because the holes are fairly large as 1/2" you can use a fine-toothed hacksaw blade in a one-hand handle. That can be pretty frustrating by lo-bucks methods.
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