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... x of the problem made things much easier.
Han Cheng rekindled the iron forge, removed the wooden handle from the back of the iron saw, and then placed it back into the forge to heat it again.
Once it was glowing red, he removed it, placed it vertically between two stones with the saw teeth facing up, and clamped it tightly. Then, he used an iron chisel to tilt the irregular, small saw teeth to the left and right.
The best way to sharpen the saw teeth wasn't to grind them ...
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