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I've used the flat mora blades Swedish made and the directions that came with the blades said not to sharpen the flat side. You have to sharpen the angel, I've used a file and stones,the file is quicker. I found that if I didn't take the nicks out they still didn't cut well.Stone the flat lightly to remove any burres. Buy a new set in case the sharpened ones don't cut.If you have a different way that works keep doing it. Good luck.
I've used the flat mora blades Swedish made and the directions that came with the blades said not to sharpen the flat side.
I use a small handheld tool that has 2 very hard fixed steel blades which are preset to the correct angle. you just draw this tool across the cutting edge of the blades a few times and you are set. I am sure that this does not get it your blades as sharp as honing, or using a nice arizona stone, but it gets the blades plenty sharp enough to shave ice. the best part is that you can easily bring it along and re-sharpen them before each hole if you want to. no need though, they hold the edge for quite a while. here is a link to the tool i speak of:http://www.amazon.com/gp/product/images/B0027VRU6C/ref=dp_image_0?ie=UTF8&n=228013&s=hi
Fish 307 does an exchange for great prices you should check them out.
no worries, just saying what works for me there's always more than one way to skin a cat, so, i guess if it feels good, do it!
I would think someone crafty could come up with some sort of jig for curved blades as well. I may need to make one for next year.