Modifying K12 barbacks for extra handlebar sweep

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5. First grinding operation complete. This will make room for new teeth to be made. Although you want to make the area farily uniform and smooth, don't worry about making a superclean finish yet, as the surface visible now will all be ground away. Getting it as uniform as possible will help with the marking operation later, so work over the surface with a hand file to ensure that there are no major high spots.