Jon1270
Minister of Fire
FWIW, (broken link removed to http://www.ebay.com/itm/110v-Chainsaw-Electric-Sharpener-Grinder-w-Grinding-Wheels-1-8-3-16-/172006853106?hash=item280c6849f2:g:ASgAAOSw14xWQAmn)and this are knock-offs of the excellent Oregon 511 grinder. A few years ago Northern Tool sold one that looked exactly like the second of those two, and it had the reputation of being a great value (though at the time it could be had for $80).