Sharpening knob cutters?

GailC

Omono
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North ID
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I bought a pretty cheap beginner set of carbon steel tools from a online vendor. They seem ok and will work for what I'm doing but the knob cutter has a couple nicks on one side and the blades don't fit together flush.
I'll write the vendor about getting a replacement but I'd still like to know, how do you sharpen a tool like this? Is there some kind of special round stone for the inside?
 
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