Source google image: https://roboproject.ru/sites/default/files/styles/250____250/public/katapulta_144_iz_144_0.jpg?itok=48qBDKgJ
Lego wedo instructions
Source google image: https://roboproject.ru/sites/default/files/styles/250____250/public/katapulta_144_iz_144_0.jpg?itok=48qBDKgJ