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I made a cardboard tube sword (with dowel and foam core) to crush my nephew in our swordfights
(lemmy.world)
Dowel running the length of it right down through the handle. Used string to compress the foam. Fed it into the tube and unwound so the foam expanded to wedge it in there so the tube can be replaced.
Next time I babysit I'm going to dominate the swordfighting... Once he admits defeat he can keep the sword
As somebody who has literally been injured with a cardboard tube to the eye (being used as a sword though sans crossguard/handle): just make sure the kids are using swinging motions rather than poking (or are very aware to stay below neck level)
Oh for sure. He is well versed in safe cardboard tube swordfighting techniques