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A very simple device that makes an incredible rumble. I didn't make this but I figured I'd document how the one I got as a gift was made. ...
cardboard tube:10.25" long2.75" inner diameter3.25" outer diameterPlastic disc for membrane:3.25" diameterapprox 0.5mm? like milk jug plastic?Spring:20" longcoils are almost 3/8" diameterGlue able to bond plastic to cardboardHot glue.
Poke a small hole in the center of the plastic membrane (hot needle?) and corkscrew a few coils of the spring through. Glue it in place. Then glue ...
Try it out by shaking. If it works, paint it and make it look awesome. So this is how mine was made judging by how it looks. Hopefully ...
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