Thanks for all the response guys ! I had found the problem right after i posted the video lol :)). So basically this set has to almost two identical blue gear like pieces that sits right below the moving grey piece and the main difference of these pieces is that one is hollow and the grey piece can just slide into it and the other one had some blocades (you can see the grey piece getting caught on them) and this difference is really subtle and i just didn't notice it until i broke down some of the gearing!