I have an Stihl HS-80 hedge clipper, 24" double sided bar. I don't use it very much through the season (maybe 25 service hours per season), but always sharpen it during the Winter. How do you sharpen your hedge clippers? I take the bar off from the transmission and completely disassemble it. In this way, I have the bars with the teeth free and can mount them in a vice. I use a hand file to sharpen the edges, reassemble the bar, then remount to the transmission. While I have it apart, I clean out the transmission and replenish with fresh grease. Is there a better way? I've learned the bolts that hold the bar together (the one penetrating the multi-part bar) tend to loosen if they have been taken off/put back on a time or two. The nuts have serrated surfaces to keep them tight. They cannot be too tightly torqued because the double reciprocating blades are too tight. If they move at all, they will run too hot when put into service. When taken off and retightened, apparently the serrations wear off slightly, enough to make them likely to come loose. Anybody have similar experiences?