Nu Vinci CVT From Ping Pong Balls

You can find a video about this here https://youtu.be/3rPKZXmBueM
to finish this you will need 3 x table tennis balls, 2 x thrust bearings 47mm by 25mm by 11mm and two springs one at 30mm by 20mm by 1.2mm wire and another at 12mm by 30mm by 1mm