Does anyone have any good advice when it comes to sharpening auger blades? It seems as though, more often than not, it turns out bad and doesn't cut anywhere as well as a new set! Is there a trick to it or just alot of practice or is it something that a professional should do? Or is it more an issue that the original bevel and thickness has been altered and no matter what you do-it just won't work?? Got me stumped! Gets pretty darned expensive to keep buying new ones-even for hand augers!