Those work really good if you pay attention to what your doing. If not you can do more damage than good in a hurry. I have used them for a couple years now and do like them.
I bought a Stihl sharpener and that Timber thing that has little carbide spinny blades. Neither was great. I'm going to try this. I cut a lot of weed so blades are expensive summertime "fun fees". I'm going to try this and see if it rips the saw out of my hands. Arr arr arr!
They have a lot of those bits to choose from could you post a picture of the shape of the one you used or describe it.
