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First of all, what steel are you using? It would help to know. If you haven't been able to draw the temperature in the spine to soften the steel you may need to go to carbide bits. The Carbide Connection is one source that I remember of suppliers with carbide bits in all the sizes. Many of the knife making suppliers carry carbide bits in fractional sizes.
Doug
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If you're not making mistakes then you're not trying hard enough
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