Ice auger blades need sharpening

[glock21]

Does anybody her sharpen auger bit blafes or know who does. I figure its better to have them sharpened then to buy a new set. 8" auger bit. Thanks.

[car-15]

I use one of these it works pretty good, I had my doubts at first but figured as cheap as it was it was worth a try and it works pretty well. iirc I got mine at gander or bass pro, I can't recall though its been a couple of years.
http://www.sportsmansguide.com/net/cb/strikemaster-lazer-deluxe-ice-auger-sharpener.aspx?a=488390