Guess I am the odd one out. I am still using the 2 blade package that I purchased about 10 years ago. I have the old sharpener that looks like a biscuit cutter. My trick is to sharpen the blades the same way my father sharpened knifes and axes. (always turn the sharpening disk the same direction - do not rotate it back and forth as you sharpen) I sharpen one side, remove the disk and flip it over to sharpen the other. Works great for me.