Sharpening your chains, yourself--
I don't see it talked about much, but I have been using Carlton sawchain for a long time. They have a little tool for their chains, (the tools vary, depending on the style chain you use), called a File-o-plate. It fits in your pocket, it's about the size of an old time, two sided razor blade. This tool is amazing, with a roud file, and a flat file, you can keep your chains cutting like new 'till you file the cutter tooth down to almost nothing. This tool keeps the rakers filed to the proper height in relation to the wear on the cutter tooth. This is the key to your chain throwing chips of wood, not sawdust. All this is done with hand held files, no clamps, or jigs to set up. Their chains wear like iron too, and I cut all hardwood. Hope this helps. I think their web site is at sawchain.com Good luck.