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In theory, if they aren't in bad shape I touch them up with a Dremel as long as they aren't so bad they need to be reset. In reality I'm usually in the middle of a hot project when a blade is too bad to use. No time to sharpen it. So I go buy a new one and tell myself I'll sharpen the dull one when I have some time. So I've only done about 2 in the last five years.
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