This is my grass whip that uses disposable utility knife blades. I think I gave this tool some credibility. And, what makes it better, is that now there are Carbide tipped blades available. They last at least 10 - 15 times longer than the regular blades. What used to take 30 - 45 minutes before (to take the cord out and the weed eater, set it all up) I can get done in less than than 10 minutes. Although it is a workout, I cannot think of a reason why not use it. Maybe a candidate for crowd source manufacturing, eh? if
Here are some pictures. I made a couple of versions. One way double sided, ambidextrous. The other one sided, which I like better. It offers more control, especially when you are swinging this around. But, it's no more dangerous than a gas weed whacker at full song with a metal blade.
Note the use of carbide blades and the use of rare earth magnets to hold the blades in place while you put it back together. The brass plate is threaded and that takes most of the impacts and sandwiches the blades together against the rock hard sugar maple body of the tool.
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