Wondering if anyone can help me. Have built the gearbox and the grey splined part beneath the two grey gears at 12o'clock seems to be wrong and causing the gears above it to lock. As well as forcing the green gear not to engage as the grey wheels are a touch too high. I can't work it out. The grey spline that sticks out is the right length according to the book. I just can't get my head round it. submitted by /u/attymatkins [link] [comments]