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I realize you made these designs for your kids but I have a feeling they will be a favorite among cospalyers as well. With that in mind, have you considered some possible mechanism for locking the blade in a closed position? Like, so you could wear it on your belt without the blade falling down? I suppose you could hang the bladed unit upside down from your belt... Other than a pin type system near the top of the hilt that when pushed in sort of pinched the blade in place, I can't really envision a way to do it. Though, I am not designer or engineer.