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Thanks for the feedback fellas. Peter, any chance you could tell me the diametre of the ones you do have so I can boggle over adapting them to mine? I guess I’d need the diametre of the inside hole as well. 

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I don't think it will help it's the thread on the inside which is a special left handed one also some of the WHB ones are curved both sides whereas these are flat one side but the dimension are od - 45mm id 12mm

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Thanks again, Peter. My neighbor is an engineer of the old school and may have the older left hand thread reamer bits still so I’ll have to check it out. 

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Yeah, they were stuck pretty good. I had a go sharpening them and one I had to leave on the spindle as I couldn’t get it off. Mine don’t have the holes for a punch though. The one that came off I got it in vice grips with some skived off sole leather scraps to soften up the teeth from scratching a bit.

Anyone have experience or good tried and true methodology for sharpening these kind of round blades?

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