Draw filing. In the image you will see burnishers,various sizes and shapes of scrapers, a scraper being draw filed. Note the direction that you will file in, this is called draw filing, hold the file as shown in the image. Use a fine cut mill bastard file, to avoid clogging files rub chalk on the file teeth. Scrapers,planes,chisels do not come from the maker sharp. In the case of cabinet scrapers which are die struck it will take a number of passes to get rid of the rollover caused by being cut with a die. If you can't find a source of cabinet scrapers you can make one from an old hand saw blade. The cabinet scraper is one of your most valuable tools.