Hey guys, just finished my file knife. I tempered at 400 for one hour for two cycles. I sanded down to perfect shape but I'm having trouble getting it very sharp. I have a worksharp guided field sharpener but jts not the best for starting edges. Do you guys have Any tips? I would prefer to use sandpaper to put an edge on it. Amy tips or something like that? I also have smaller air grinders that I can adjust the speed on that are used in the automotive world. Thanks