I do sharpen by seam rippers and sergical blades. I collect them until i run out of sharp ones then sharpen them all at one sitting. First I put on leather gloves. I take my dremel tool with a cotton polishing disc. apply red polishing rouge to the cotton disc. turn on dremel then sharpen ripper with the wheel running from the thicker part towards the edge. turn the ripper over and repeat on the other side. being careful always make sure the wheel is not turning into the sharp edge. you don't want a sharp object flying out of your hand! when sharping sergical blades you only need to sharpen the side with the bevel. again make sure the wheel is not turning towards the sharp edge. this sharpens them pretty quickly. Hope this helps.