I'm finding that the hardest part of this whole project of burning wood is keeping a sharp chain on the saw (Husqvarna 455, if that matters). I've been taking the chain to a shop to be ground after I file it a couple times, but I've figured out that they are abusing the chain more than I am -- they take off about half the cutter, and almost as much of the raker. I need to figure out how to do this myself. I have a "Forester" file kit, with a stamped steel guide that fits on the file; I haven't found this to be any better than freehanding the file. I also have a "Pferd" file kit, with the guide that holds the round file as well as a flat file for the rakers; this seems to be a much better tool. Still, I am having one problem. I have not figured out how to get the edge on the top plate of the cutter sharp. The side plate I can sharpen fine, and the point is a little less sharp, but the top plate seems not to contact the file correctly to put an edge on it. I think I have the 25 degree angle of the top plate correct, and I put about a 10 degree angle downward (this I gleaned from the manual that came with the saw, though I am now using Carlton chains that the shop sold me since that is what they carry) on the file. Any ideas as to why the top plate might not be getting sharp like it is supposed to? I'd like to figure out how to hand file, since it seems like plenty of folks here do only this and keep their chains plenty sharp.