Spring for Ping Pong Ball launcher. See Moving On To The Ping Pong Launcher by Klaudiusz Kolaszewski and Choosing the Design by David Rohu


Using Hooke's Law

Food Grade Stainless Steel 316 304 Wire Whisk Mixing Ball for Shaker Bottle by Farview Spring, a subsidiary of Farview International Trade Co., Ltd. Beijing
Beryllium Copper Spring by Fuzhou Hengsheng Spring Co., Ltd on Alibaba.com - requested size 40mm diameter (ping pong ball size), height around 50mm with 5 coils. Wire thickness around 2mm.
Farview Compress Spring sells mixing balls.


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