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Originally Posted by Kyobanim
That's a good question. The idea is to push the apple through the sword with a push, not a full on kick, so I don't think surgical sharpness is necessary. Maybe sharp enough to cut paper?
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Just a thought, Sir: If you touch the sword, you will be injured regardless of the level of sharpness, since you'll have wanted to have it sharp enough for the demonstration.
Wouldn't it in that case be smart to have it as sharp as possible so less force is required, thus minimizing risk of going too far?