some of you probably know what I am talking about and are using these chains ... my son bought a new style chain for his chainsawthat was different from anything I ever sawed with ever ,,.. and I like it very much ,.. we had some ornery old pignut hickory logs that were cut 3 -4 yrs ago that mean seasoned hickory was killing our chains on the saws ,,.. so ,Michael camehere today with a chain that can actually be sharpened by setting the sharpening device on the snout of the bar , starting the saw and by depressing the device it makes contact with the chain and puts a fine sharp edge that cuts great ,,. we cut up 5- 30 ft seasoned hickory logs into blox before the saw run out of gas,. these blox are 2 ft thru ,, and the chain never needed sharpening , it turned a nitemare into a dream ,.does anyone have a link for more info