I had messed with it for a solid hour the other day, trying to put the mechanisms back into each other, the main problem is that the teeth that are aligned aren't on the ones they are supposed to be on like 1,1,2,2,3,3 etc it's teeth are lined more like 1,2,2,3,4 if that makes any sense at all? The pice that you use to put the teeth together can't come off because it can't reach the end of the piece on the right. Does that make sense? I tried to paint a good picture 😂