Oh yeah. I have tried several different methods of sharpening them. The trick is to keep them even. Without building a fixture to hold them it is tough, but do-able. A file will work but a grinder is way better.
I like the grinder too.
I use the round side of my 5" wheel to get a nice hollow grind like from the factory. That reminds me, I need to get a smaller grit wheel for sharpening other things.
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I'll need some Christine. Judd, I've sharpened mine to the point where I removed all the metal on a few and had the threads showing through. I used a screw to mount the tips to and hold onto while I sharpen them with a file. I know the grinder would be many times better.