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And I can't forget my favorite maintenance tool for my four year old $20 machete.
The $10 speedy sharp. This little bastard is a chunk of tungsten that can carve steel. Used properly it can hone blades back into shape, but if you have a badly abused blade. (say, one that's been used to chop into concrete) it can carve a new edge into a machetes blade in a matter of ten minutes or so.