Ed says the 160 and el-grande have the right steel (hard and tough).if you use an extra coarse (220 grit) diamond plate for sharpening/shaping, it is not too bad. takes time though. i do it sitting in front of the boob tube at night. I do one a night when i do them. I found there is a lot of work to get the flat sides flat. lots of braze at the tip to file off. others have complained about how hard they are. forget about a regular file. a nicholson 20189n 14" milled tooth bodifile,flex file standard, that Ed recommends may work faster. I have yet to try it. This would be the ONLY file to try.I found them online for $26 US but my dad has a bunch (retired autobody man).
FYI-samurai swords are not made of stainless steel. these are the strongest,toughest,sharpest swords ever made. they are high carbon,folded,forged,carbon location designed swords. to my knowledge, all stainless steels(regular common variety-ie all stainless broadheads except one) cannnot match these properties. this is what makes the grizzly so hard. Files are made of 1095 carbon steel or W1. thats why they are so hard (but somewhat brittle-because of the temper)