CVT from LEGO with explanation, most simple LEGO CVT

Continuous variable transmission gear made of LEGO parts. Step by step from idea to real working CVT. Used in simple roundabout. This is most simple CVT made of LEGO parts. No slipping machine, high friction. Educational video to explain principles of CVT, how it works. The original idea of ball based CVT was invented by Leonardo Da Vinci and simmilar design from lego bricks was presented by Lego Technic Mastery channel. But there was no explanation of basic principles of this awesome mechanism.