Huw Millington

Yes, that was my thinking too, after @R0Sch pointed out the potential problem with my solution which he posted above. I hadn't considered adding the 3l axles top and bottom but that's a great idea because any slack between the liftarms and the gears, which might cause the gears to misalign vertically, can be removed by tightening them slightly.

Which store did you find them in?

@Lyichir, I don't think I 'treat[ed] a rumor page in a magazine as gospel.' I just posted what was stated in it and said I could believe it.

Dylan has obtained this image from a private Slack group for Brickset reviewers and posted it here without authority. LEGO has noticed it and I have had to apologise. I would appreciate it if it's not distributed further. Due to this grave error of judgement Dylan is no longer involved at Brickset. Huw Director, Brickset.com

Would you like to get involved with an exciting project related to Harry Potter LEGO? If so, let me know, via my profile, why you think you fit the bill and I'll forward your message on to the company running the project. Thanks Huw (@brickset.com)