Bearings i used: https://www.123-3d.nl/123-3D-Kogellager-623ZZ-1-stuk-i18-t13131.html
This model is great if you cannot get the same bearings as the tutorial did like me.
in the picture with multiple prototypes the bottom one is the one i used, you can also see it in action.
The author remixed this model.
The holes for the bearings are bigger in the passive arm for bigger bearings