How to Sharpen Metal Files

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Sharping file is fast and easy. Watch this video and learn how chemically sharpen your metal files. • Give it a try, it really dose sharpen the file. I promise you, you will be surprised. One side note the file must be dull not damaged to work. :-) • Popular mechanics article from 1992 with microscope before and after photos • https://books.google.com/books?id=seM... • Check out his link on Google books to learn how it works. • Workshop Receipts: For Manufacturers and Scientific Amateurs, Volume 2 page 235 • https://books.google.com/books?id=ApF...

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