I've been putting off sharpening my chisels because I'm too lazy to bust out the sharpening guide (a cheapo version that I never really liked very much) and I'm never satisfied with my freehand honing. I've seen people talk about hollowing out the primary bevel of a chisel using a bench grinder, which makes freehand honing easier, so I'd like to try that. Unfortunately, I don't have a bench grinder. In principal it seems like you could get the same effect using just a round file (or a dremel tool, which I have). Any reason this wouldn't work?