gautdo

YES ! I found the problem ! I've swapped to gear ! Thank you for your help, now i'ts working fine. I was at the end of the phase 1 so I had a lot to deconstruct but it worth it.

Great, thank you already for that ! One more question : what piece is just below the big grey one ?

Hi I just bought the set but something doesn't seem right with gear at the back. At the page 28 of the first set, instruction 45, the gear seems a bit too large to fit properly, when it's installed, the gear can't turn freely. Is it just me or someone else as the same problem ? Did I miss something ? Thank you for your help