Couple years back, bought a used Chicago Electric chain saw sharpener. Paid fifteen bucks for it in thrift store. This week have been cutting down, and cutting into fire wood lengths four dead trees from our front lot. Not sure of species, only that they are hard and have a stringy trunk . You can't split them with an axe, but a 48,000# thrust log splitter has no problem splitting them. Because of toughness of wood, needed to sharpen chain saw. Used my HF sharpener, and it did a GREAT JOB. After sharpening, chips the size of raisins were being emitted from cut. New, at HF, this sharpener sells for $29.99. No it's not a $169 Oregon, but does a more than adequate job.