Are you using the standard little red disks, the fiberglass reinforced, or the metal? I think they're all called "reinforced". It does take some practice to not waste disks, the first time I tried ...
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How To Cut Sheet Metal

When cutting sheet metal, it's crucial to use the correct methods to get the best results while staying safe. You may need to know how to cut sheet metal while working on DIY craft projects, gutter ...
There’s nothing wrong with using a good, old-fashioned hacksaw, but there are faster, easier ways to cut metal. We’ll show you power tool tips and techniques for cutting the types and thicknesses of ...