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Thanks for the replies. Once I saw that it was called a feather file, I was able to find a small one for about $9. I ordered it and now I can see if I can sharpen my old saws.
Even $15 each would be a great deal. Is that total cost?I sharpen Sugoi saws with a Silky feather file. You can find feather files at wood working supply stores too.
I have sharpened Tsurugi blades with a dremmel and small sanding disk. It chewed through the disks. I picked up some really thin diamond disks but haven't tried them yet.... I suspect they will work well for the impulse hardened blades. I picked up 3 new Tsurugi blades from Amazon for $15 so not real motivated to try yet.