Started working on this kamisori today. I know enough to assume that Azuma might not be the maker even though the handle says so. But I'm not an expert in any way of even basic understanding of kanji.
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The handle shattered as soon as I put some pressure on it with the razor knife.Attachment 305016
After some wet sanding.
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Still have a bit more sanding and polishing to go, but so far it seems to be going easier than I thought.