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Yes. But the smart thing is that he created a homemade jig that keeps the bevel of the blade at a consistent angle. It's a lot of work filing away at that blade, and it's easy to get sloppy. His jig prevents that.
The idea is not a groundbreaking new one, but it's nothing I taught him, and he cobbled together 6 different items to work together to give him what he was looking for.
It's not the cure for cancer, but it's showing some thought.
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