Newton's Cradle Mechanism
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Newton's Cradle Mechanism: A Wonderful Gift for you family That You Will Have Time To Make For The New Year With Your Own Hands All you need is: Plastic ~100 grams balls from the bearing 20mm x5 pcs Metal rod 35 centimeter x 2 pcs -drill holes and then bend Scraps of Fishing Hook with Ring x5 pcs Strong thread or fishing line
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