Has anyone had luck sharpening these? I forgot to throw the chipper on last winter when going to fish the river and the sand tore it up, had a hell of a time drilling just a few holes. I tried using their hand sharpener and it didn't do any good. The blades actually feel fairly sharp but they get no cut. Could they be bent? I loved the lazer blades when new but might have to stick with the slower chipper ones since they can take a beating anyway.